diff --git a/src/Controller/AdminPages/BaseAdminController.php b/src/Controller/AdminPages/BaseAdminController.php
index 2b2e0f90..fd86769c 100644
--- a/src/Controller/AdminPages/BaseAdminController.php
+++ b/src/Controller/AdminPages/BaseAdminController.php
@@ -46,7 +46,6 @@ use App\DataTables\LogDataTable;
 use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\Base\AbstractStructuralDBElement;
 use App\Entity\LabelSystem\LabelProfile;
-use App\Entity\Parts\PartLot;
 use App\Entity\UserSystem\User;
 use App\Events\SecurityEvent;
 use App\Events\SecurityEvents;
@@ -94,7 +93,9 @@ abstract class BaseAdminController extends AbstractController
     protected $historyHelper;
     protected $timeTravel;
     protected $dataTableFactory;
-    /** @var EventDispatcher */
+    /**
+     * @var EventDispatcher
+     */
     protected $eventDispatcher;
     protected $labelGenerator;
     protected $barcodeExampleGenerator;
@@ -165,7 +166,7 @@ abstract class BaseAdminController extends AbstractController
             $table = null;
         }
 
-        $form_options =  [
+        $form_options = [
             'attachment_class' => $this->attachment_class,
             'parameter_class' => $this->parameter_class,
             'disabled' => null !== $timeTravel_timestamp ? true : false,
@@ -174,8 +175,8 @@ abstract class BaseAdminController extends AbstractController
         //Disable editing of options, if user is not allowed to use twig...
         if (
             $entity instanceof LabelProfile
-            && $entity->getOptions()->getLinesMode() === 'twig'
-            && !$this->isGranted('@labels.use_twig')
+            && 'twig' === $entity->getOptions()->getLinesMode()
+            && ! $this->isGranted('@labels.use_twig')
         ) {
             $form_options['disable_options'] = true;
         }
diff --git a/src/Controller/AdminPages/LabelProfileController.php b/src/Controller/AdminPages/LabelProfileController.php
index a1b64058..6854e32e 100644
--- a/src/Controller/AdminPages/LabelProfileController.php
+++ b/src/Controller/AdminPages/LabelProfileController.php
@@ -43,12 +43,8 @@ declare(strict_types=1);
 namespace App\Controller\AdminPages;
 
 use App\Entity\Attachments\AttachmentType;
-use App\Entity\Attachments\AttachmentTypeAttachment;
 use App\Entity\Attachments\LabelAttachment;
 use App\Entity\LabelSystem\LabelProfile;
-use App\Entity\Parameters\AttachmentTypeParameter;
-use App\Form\AdminPages\AttachmentTypeAdminForm;
-use App\Form\AdminPages\BaseEntityAdminForm;
 use App\Form\AdminPages\LabelProfileAdminForm;
 use App\Services\EntityExporter;
 use App\Services\EntityImporter;
diff --git a/src/Controller/LabelController.php b/src/Controller/LabelController.php
index 29a564f5..ac888ccb 100644
--- a/src/Controller/LabelController.php
+++ b/src/Controller/LabelController.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,16 +23,11 @@
 
 namespace App\Controller;
 
-
 use App\Entity\Base\AbstractDBElement;
-use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\LabelSystem\LabelProfile;
-use App\Entity\Parts\Part;
 use App\Exceptions\TwigModeException;
-use App\Form\LabelOptionsType;
 use App\Form\LabelSystem\LabelDialogType;
-use App\Helpers\LabelResponse;
 use App\Repository\DBElementRepository;
 use App\Services\ElementTypeNameGenerator;
 use App\Services\LabelSystem\LabelGenerator;
@@ -38,17 +36,12 @@ use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormError;
-use Symfony\Component\Form\SubmitButton;
-use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpFoundation\ResponseHeaderBag;
 use Symfony\Component\Routing\Annotation\Route;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @Route("/label")
- * @package App\Controller
  */
 class LabelController extends AbstractController
 {
@@ -77,7 +70,7 @@ class LabelController extends AbstractController
         $this->denyAccessUnlessGranted('@labels.create_labels');
 
         //If we inherit a LabelProfile, the user need to have access to it...
-        if ($profile !== null) {
+        if (null !== $profile) {
             $this->denyAccessUnlessGranted('read', $profile);
         }
 
@@ -88,7 +81,7 @@ class LabelController extends AbstractController
         }
 
         //We have to disable the options, if twig mode is selected and user is not allowed to use it.
-        $disable_options = $label_options->getLinesMode() === 'twig' && !$this->isGranted("@labels.use_twig");
+        $disable_options = 'twig' === $label_options->getLinesMode() && ! $this->isGranted('@labels.use_twig');
 
         $form = $this->createForm(LabelDialogType::class, null, [
             'disable_options' => $disable_options,
@@ -99,14 +92,13 @@ class LabelController extends AbstractController
         $target_id = $request->query->get('target_id', null);
         $generate = $request->query->getBoolean('generate', false);
 
-        if ($profile === null && is_string($target_type)) {
+        if (null === $profile && is_string($target_type)) {
             $label_options->setSupportedElement($target_type);
         }
         if (is_string($target_id)) {
             $form['target_id']->setData($target_id);
         }
 
-
         $form['options']->setData($label_options);
         $form->handleRequest($request);
 
@@ -117,17 +109,16 @@ class LabelController extends AbstractController
         $filename = 'invalid.pdf';
 
         //Generate PDF either when the form is submitted and valid, or the form  was not submit yet, and generate is set
-        if (($form->isSubmitted() && $form->isValid()) || ($generate && !$form->isSubmitted() && $profile !== null)) {
+        if (($form->isSubmitted() && $form->isValid()) || ($generate && ! $form->isSubmitted() && null !== $profile)) {
             $target_id = (string) $form->get('target_id')->getData();
             $targets = $this->findObjects($form_options->getSupportedElement(), $target_id);
-            if (!empty($targets)) {
+            if (! empty($targets)) {
                 try {
                     $pdf_data = $this->labelGenerator->generateLabel($form_options, $targets);
                     $filename = $this->getLabelName($targets[0], $profile);
                 } catch (TwigModeException $exception) {
                     $form->get('options')->get('lines')->addError(new FormError($exception->getMessage()));
                 }
-
             } else {
                 //$this->addFlash('warning', 'label_generator.no_entities_found');
                 $form->get('target_id')->addError(
@@ -146,15 +137,15 @@ class LabelController extends AbstractController
 
     protected function getLabelName(AbstractDBElement $element, ?LabelProfile $profile = null): string
     {
-        $ret = 'label_' . $this->elementTypeNameGenerator->getLocalizedTypeLabel($element);
+        $ret = 'label_'.$this->elementTypeNameGenerator->getLocalizedTypeLabel($element);
         $ret .= $element->getID();
 
-        return $ret . '.pdf';
+        return $ret.'.pdf';
     }
 
     protected function findObjects(string $type, string $ids): array
     {
-        if(!isset(LabelGenerator::CLASS_SUPPORT_MAPPING[$type])) {
+        if (! isset(LabelGenerator::CLASS_SUPPORT_MAPPING[$type])) {
             throw new \InvalidArgumentException('The given type is not known and can not be mapped to a class!');
         }
 
@@ -162,6 +153,7 @@ class LabelController extends AbstractController
 
         /** @var DBElementRepository $repo */
         $repo = $this->em->getRepository(LabelGenerator::CLASS_SUPPORT_MAPPING[$type]);
+
         return $repo->getElementsFromIDArray($id_array);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Controller/ScanController.php b/src/Controller/ScanController.php
index 3d4ce484..880af1a6 100644
--- a/src/Controller/ScanController.php
+++ b/src/Controller/ScanController.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,20 +23,17 @@
 
 namespace App\Controller;
 
-
 use App\Form\LabelSystem\ScanDialogType;
-use App\Services\LabelSystem\Barcodes\BarcodeRedirector;
 use App\Services\LabelSystem\Barcodes\BarcodeNormalizer;
+use App\Services\LabelSystem\Barcodes\BarcodeRedirector;
 use Doctrine\ORM\EntityNotFoundException;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
-use Symfony\Component\Form\FormError;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Annotation\Route;
 
 /**
  * @Route("/scan")
- * @package App\Controller
  */
 class ScanController extends AbstractController
 {
@@ -58,8 +58,10 @@ class ScanController extends AbstractController
 
         if ($form->isSubmitted() && $form->isValid()) {
             $input = $form['input']->getData();
+
             try {
                 [$type, $id] = $this->barcodeNormalizer->normalizeBarcodeContent($input);
+
                 try {
                     return $this->redirect($this->barcodeParser->getRedirectURL($type, $id));
                 } catch (EntityNotFoundException $exception) {
@@ -76,18 +78,18 @@ class ScanController extends AbstractController
     }
 
     /**
-     * The route definition for this action is done in routes.yaml, as it does not use the _locale prefix as the other routes
-     * @param  string  $type
-     * @param  int  $id
+     * The route definition for this action is done in routes.yaml, as it does not use the _locale prefix as the other routes.
      */
     public function scanQRCode(string $type, int $id): Response
     {
         try {
             $this->addFlash('success', 'scan.qr_success');
+
             return $this->redirect($this->barcodeParser->getRedirectURL($type, $id));
         } catch (EntityNotFoundException $exception) {
             $this->addFlash('success', 'scan.qr_not_found');
+
             return $this->redirectToRoute('homepage');
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Controller/UserSettingsController.php b/src/Controller/UserSettingsController.php
index 58e0fabf..7ff41a65 100644
--- a/src/Controller/UserSettingsController.php
+++ b/src/Controller/UserSettingsController.php
@@ -72,7 +72,9 @@ use Symfony\Component\Validator\Constraints\Length;
 class UserSettingsController extends AbstractController
 {
     protected $demo_mode;
-    /** @var EventDispatcher */
+    /**
+     * @var EventDispatcher
+     */
     protected $eventDispatcher;
 
     public function __construct(bool $demo_mode, EventDispatcherInterface $eventDispatcher)
diff --git a/src/DataFixtures/LabelProfileFixtures.php b/src/DataFixtures/LabelProfileFixtures.php
index fa1a72b4..24a08f3d 100644
--- a/src/DataFixtures/LabelProfileFixtures.php
+++ b/src/DataFixtures/LabelProfileFixtures.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\DataFixtures;
 
-
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\LabelSystem\LabelProfile;
 use Doctrine\Bundle\FixturesBundle\Fixture;
@@ -29,7 +31,6 @@ use Doctrine\Persistence\ObjectManager;
 
 class LabelProfileFixtures extends Fixture
 {
-
     protected $em;
 
     public function __construct(EntityManagerInterface $entityManager)
@@ -37,9 +38,9 @@ class LabelProfileFixtures extends Fixture
         $this->em = $entityManager;
     }
 
-    public function load(ObjectManager $manager)
+    public function load(ObjectManager $manager): void
     {
-        $this->em->getConnection()->exec("ALTER TABLE `label_profiles` AUTO_INCREMENT = 1;");
+        $this->em->getConnection()->exec('ALTER TABLE `label_profiles` AUTO_INCREMENT = 1;');
 
         $profile1 = new LabelProfile();
         $profile1->setName('Profile 1');
@@ -77,13 +78,12 @@ class LabelProfileFixtures extends Fixture
 
         $manager->persist($profile3);
 
-
         $profile4 = new LabelProfile();
         $profile4->setName('Profile 4');
         $profile4->setShowInDropdown(true);
 
         $option4 = new LabelOptions();
-        $option4->setLines("{{ element.name }}");
+        $option4->setLines('{{ element.name }}');
         $option4->setBarcodeType('code39');
         $option4->setSupportedElement('part');
         $option4->setLinesMode('twig');
@@ -93,4 +93,4 @@ class LabelProfileFixtures extends Fixture
 
         $manager->flush();
     }
-}
\ No newline at end of file
+}
diff --git a/src/DataTables/Adapter/ORMAdapter.php b/src/DataTables/Adapter/ORMAdapter.php
index 157ce4f0..b1d0bf18 100644
--- a/src/DataTables/Adapter/ORMAdapter.php
+++ b/src/DataTables/Adapter/ORMAdapter.php
@@ -38,21 +38,33 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
  */
 class ORMAdapter extends AbstractAdapter
 {
-    /** @var EntityManager */
+    /**
+     * @var EntityManager
+     */
     protected $manager;
 
-    /** @var \Doctrine\ORM\Mapping\ClassMetadata */
+    /**
+     * @var \Doctrine\ORM\Mapping\ClassMetadata
+     */
     protected $metadata;
 
-    /** @var QueryBuilderProcessorInterface[] */
+    /**
+     * @var QueryBuilderProcessorInterface[]
+     */
     protected $criteriaProcessors;
-    /** @var ManagerRegistry */
+    /**
+     * @var ManagerRegistry
+     */
     private $registry;
 
-    /** @var int */
+    /**
+     * @var int
+     */
     private $hydrationMode;
 
-    /** @var QueryBuilderProcessorInterface[] */
+    /**
+     * @var QueryBuilderProcessorInterface[]
+     */
     private $queryBuilderProcessors;
 
     /**
diff --git a/src/Entity/Attachments/LabelAttachment.php b/src/Entity/Attachments/LabelAttachment.php
index 65d31f42..53927edf 100644
--- a/src/Entity/Attachments/LabelAttachment.php
+++ b/src/Entity/Attachments/LabelAttachment.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Entity\Attachments;
 
-
 use App\Entity\LabelSystem\LabelProfile;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
@@ -41,4 +43,4 @@ class LabelAttachment extends Attachment
      * @ORM\JoinColumn(name="element_id", referencedColumnName="id", nullable=false, onDelete="CASCADE").
      */
     protected $element;
-}
\ No newline at end of file
+}
diff --git a/src/Entity/Contracts/TimeTravelInterface.php b/src/Entity/Contracts/TimeTravelInterface.php
index 0e522f40..d15416a0 100644
--- a/src/Entity/Contracts/TimeTravelInterface.php
+++ b/src/Entity/Contracts/TimeTravelInterface.php
@@ -33,7 +33,9 @@ interface TimeTravelInterface
      */
     public function hasOldDataInformations(): bool;
 
-    /** Returns the data the entity had before this log entry. */
+    /**
+     * Returns the data the entity had before this log entry.
+     */
     public function getOldData(): array;
 
     /**
diff --git a/src/Entity/LabelSystem/LabelOptions.php b/src/Entity/LabelSystem/LabelOptions.php
index 8907169e..4213f008 100644
--- a/src/Entity/LabelSystem/LabelOptions.php
+++ b/src/Entity/LabelSystem/LabelOptions.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -96,12 +99,12 @@ class LabelOptions
     }
 
     /**
-     * @param  float  $width
      * @return LabelOptions
      */
-    public function setWidth(float $width): LabelOptions
+    public function setWidth(float $width): self
     {
         $this->width = $width;
+
         return $this;
     }
 
@@ -114,12 +117,12 @@ class LabelOptions
     }
 
     /**
-     * @param  float  $height
      * @return LabelOptions
      */
-    public function setHeight(float $height): LabelOptions
+    public function setHeight(float $height): self
     {
         $this->height = $height;
+
         return $this;
     }
 
@@ -132,12 +135,12 @@ class LabelOptions
     }
 
     /**
-     * @param  string  $barcode_type
      * @return LabelOptions
      */
-    public function setBarcodeType(string $barcode_type): LabelOptions
+    public function setBarcodeType(string $barcode_type): self
     {
         $this->barcode_type = $barcode_type;
+
         return $this;
     }
 
@@ -150,12 +153,12 @@ class LabelOptions
     }
 
     /**
-     * @param  string  $picture_type
      * @return LabelOptions
      */
-    public function setPictureType(string $picture_type): LabelOptions
+    public function setPictureType(string $picture_type): self
     {
         $this->picture_type = $picture_type;
+
         return $this;
     }
 
@@ -168,12 +171,12 @@ class LabelOptions
     }
 
     /**
-     * @param  string  $supported_element
      * @return LabelOptions
      */
-    public function setSupportedElement(string $supported_element): LabelOptions
+    public function setSupportedElement(string $supported_element): self
     {
         $this->supported_element = $supported_element;
+
         return $this;
     }
 
@@ -186,17 +189,18 @@ class LabelOptions
     }
 
     /**
-     * @param  string  $lines
      * @return LabelOptions
      */
-    public function setLines(string $lines): LabelOptions
+    public function setLines(string $lines): self
     {
         $this->lines = $lines;
+
         return $this;
     }
 
     /**
-     * Gets additional CSS (it will simply be attached 
+     * Gets additional CSS (it will simply be attached.
+     *
      * @return string
      */
     public function getAdditionalCss(): string
@@ -205,13 +209,12 @@ class LabelOptions
     }
 
     /**
-     *
-     * @param  string  $additional_css
      * @return LabelOptions
      */
-    public function setAdditionalCss(string $additional_css): LabelOptions
+    public function setAdditionalCss(string $additional_css): self
     {
         $this->additional_css = $additional_css;
+
         return $this;
     }
 
@@ -224,17 +227,12 @@ class LabelOptions
     }
 
     /**
-     * @param  string  $lines_mode
      * @return LabelOptions
      */
-    public function setLinesMode(string $lines_mode): LabelOptions
+    public function setLinesMode(string $lines_mode): self
     {
         $this->lines_mode = $lines_mode;
+
         return $this;
     }
-
-
-
-
-
-}
\ No newline at end of file
+}
diff --git a/src/Entity/LabelSystem/LabelProfile.php b/src/Entity/LabelSystem/LabelProfile.php
index 0311e64b..732d0850 100644
--- a/src/Entity/LabelSystem/LabelProfile.php
+++ b/src/Entity/LabelSystem/LabelProfile.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -32,7 +35,6 @@ use Symfony\Component\Validator\Constraints as Assert;
  * @ORM\Table(name="label_profiles")
  * @ORM\EntityListeners({"App\EntityListeners\TreeCacheInvalidationListener"})
  * @UniqueEntity({"name", "options.supported_element"})
- * @package App\Entity\LabelSystem
  */
 class LabelProfile extends AttachmentContainingDBElement
 {
@@ -73,14 +75,16 @@ class LabelProfile extends AttachmentContainingDBElement
         return $this->options;
     }
 
-    public function setOptions(LabelOptions $labelOptions): LabelProfile
+    public function setOptions(LabelOptions $labelOptions): self
     {
         $this->options = $labelOptions;
+
         return $this;
     }
 
     /**
      * Get the comment of the element.
+     *
      * @return string the comment
      */
     public function getComment(): ?string
@@ -91,11 +95,13 @@ class LabelProfile extends AttachmentContainingDBElement
     public function setComment(string $new_comment): string
     {
         $this->comment = $new_comment;
+
         return $this;
     }
 
     /**
      * Returns true, if this label profile should be shown in label generator quick menu.
+     *
      * @return bool
      */
     public function isShowInDropdown(): bool
@@ -105,22 +111,18 @@ class LabelProfile extends AttachmentContainingDBElement
 
     /**
      * Sets the show in dropdown menu.
-     * @param  bool  $show_in_dropdown
+     *
      * @return LabelProfile
      */
-    public function setShowInDropdown(bool $show_in_dropdown): LabelProfile
+    public function setShowInDropdown(bool $show_in_dropdown): self
     {
         $this->show_in_dropdown = $show_in_dropdown;
+
         return $this;
     }
 
-
-
-    /**
-     * @inheritDoc
-     */
     public function getIDString(): string
     {
         return 'LP'.sprintf('%09d', $this->getID());
     }
-}
\ No newline at end of file
+}
diff --git a/src/Entity/LogSystem/AbstractLogEntry.php b/src/Entity/LogSystem/AbstractLogEntry.php
index 829dad48..3f8e9954 100644
--- a/src/Entity/LogSystem/AbstractLogEntry.php
+++ b/src/Entity/LogSystem/AbstractLogEntry.php
@@ -120,7 +120,9 @@ abstract class AbstractLogEntry extends AbstractDBElement
     protected const TARGET_TYPE_PARAMETER = 18;
     protected const TARGET_TYPE_LABEL_PROFILE = 19;
 
-    /** @var array This const is used to convert the numeric level to a PSR-3 compatible log level */
+    /**
+     * @var array This const is used to convert the numeric level to a PSR-3 compatible log level
+     */
     protected const LEVEL_ID_TO_STRING = [
         self::LEVEL_EMERGENCY => LogLevel::EMERGENCY,
         self::LEVEL_ALERT => LogLevel::ALERT,
diff --git a/src/EventSubscriber/LogSystem/EventLoggerSubscriber.php b/src/EventSubscriber/LogSystem/EventLoggerSubscriber.php
index bf53115b..281d0a12 100644
--- a/src/EventSubscriber/LogSystem/EventLoggerSubscriber.php
+++ b/src/EventSubscriber/LogSystem/EventLoggerSubscriber.php
@@ -70,12 +70,16 @@ use Symfony\Component\Serializer\SerializerInterface;
  */
 class EventLoggerSubscriber implements EventSubscriber
 {
-    /** @var array The given fields will not be saved, because they contain sensitive informations */
+    /**
+     * @var array The given fields will not be saved, because they contain sensitive informations
+     */
     protected const FIELD_BLACKLIST = [
         User::class => ['password', 'need_pw_change', 'googleAuthenticatorSecret', 'backupCodes', 'trustedDeviceCookieVersion', 'pw_reset_token', 'backupCodesGenerationDate'],
     ];
 
-    /** @var array If elements of the given class are deleted, a log for the given fields will be triggered */
+    /**
+     * @var array If elements of the given class are deleted, a log for the given fields will be triggered
+     */
     protected const TRIGGER_ASSOCIATION_LOG_WHITELIST = [
         PartLot::class => ['part'],
         Orderdetail::class => ['part'],
diff --git a/src/EventSubscriber/UserSystem/RegisterU2FSubscriber.php b/src/EventSubscriber/UserSystem/RegisterU2FSubscriber.php
index a6c986f5..190dbc65 100644
--- a/src/EventSubscriber/UserSystem/RegisterU2FSubscriber.php
+++ b/src/EventSubscriber/UserSystem/RegisterU2FSubscriber.php
@@ -69,7 +69,9 @@ final class RegisterU2FSubscriber implements EventSubscriberInterface
      */
     private $router;
 
-    /** @var EventDispatcher */
+    /**
+     * @var EventDispatcher
+     */
     private $eventDispatcher;
 
     public function __construct(UrlGeneratorInterface $router, EntityManagerInterface $entityManager, FlashBagInterface $flashBag, EventDispatcherInterface $eventDispatcher, bool $demo_mode)
diff --git a/src/Exceptions/TwigModeException.php b/src/Exceptions/TwigModeException.php
index 67e54059..52d125e1 100644
--- a/src/Exceptions/TwigModeException.php
+++ b/src/Exceptions/TwigModeException.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,14 +23,12 @@
 
 namespace App\Exceptions;
 
-
-use Throwable;
 use Twig\Error\Error;
 
 class TwigModeException extends \RuntimeException
 {
-    public function __construct(Error $previous = null)
+    public function __construct(?Error $previous = null)
     {
         parent::__construct($previous->getMessage(), 0, $previous);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Form/AdminPages/BaseEntityAdminForm.php b/src/Form/AdminPages/BaseEntityAdminForm.php
index 4fdb7c55..b4d20ea8 100644
--- a/src/Form/AdminPages/BaseEntityAdminForm.php
+++ b/src/Form/AdminPages/BaseEntityAdminForm.php
@@ -45,7 +45,6 @@ namespace App\Form\AdminPages;
 use App\Entity\Attachments\Attachment;
 use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\Base\AbstractStructuralDBElement;
-use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\LabelSystem\LabelProfile;
 use App\Form\AttachmentFormType;
 use App\Form\ParameterType;
@@ -106,7 +105,7 @@ class BaseEntityAdminForm extends AbstractType
                     'class' => get_class($entity),
                     'required' => false,
                     'label' => 'parent.label',
-                    'disabled' => !$this->security->isGranted($is_new ? 'create' : 'move', $entity),
+                    'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'move', $entity),
                 ]
             )
                 ->add(
@@ -119,7 +118,7 @@ class BaseEntityAdminForm extends AbstractType
                         'label_attr' => [
                             'class' => 'checkbox-custom',
                         ],
-                        'disabled' => !$this->security->isGranted($is_new ? 'create' : 'edit', $entity),
+                        'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
                     ]
                 );
         }
@@ -135,7 +134,7 @@ class BaseEntityAdminForm extends AbstractType
                         'rows' => 4,
                     ],
                     'help' => 'bbcode.hint',
-                    'disabled' => !$this->security->isGranted($is_new ? 'create' : 'edit', $entity),
+                    'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
                 ]
             );
         }
@@ -178,7 +177,7 @@ class BaseEntityAdminForm extends AbstractType
                     'entry_type' => ParameterType::class,
                     'allow_add' => $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
                     'allow_delete' => $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
-                    'disabled' => !$this->security->isGranted($is_new ? 'create' : 'edit', $entity),
+                    'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
                     'reindex_enable' => true,
                     'label' => false,
                     'by_reference' => false,
diff --git a/src/Form/AdminPages/LabelProfileAdminForm.php b/src/Form/AdminPages/LabelProfileAdminForm.php
index b77aa502..38cd05ef 100644
--- a/src/Form/AdminPages/LabelProfileAdminForm.php
+++ b/src/Form/AdminPages/LabelProfileAdminForm.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Form\AdminPages;
 
-
 use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\LabelSystem\LabelProfile;
 use App\Form\LabelOptionsType;
@@ -30,9 +32,15 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class LabelProfileAdminForm extends BaseEntityAdminForm
 {
+    public function configureOptions(OptionsResolver $resolver): void
+    {
+        parent::configureOptions($resolver);
+        $resolver->setDefault('data_class', LabelProfile::class);
+        $resolver->setDefault('disable_options', false);
+    }
+
     protected function additionalFormElements(FormBuilderInterface $builder, array $options, AbstractNamedDBElement $entity): void
     {
-
         $builder->add('show_in_dropdown', CheckboxType::class, [
             'required' => false,
             'label' => 'label_profile.showInDropdown',
@@ -45,11 +53,4 @@ class LabelProfileAdminForm extends BaseEntityAdminForm
             'disabled' => $options['disable_options'],
         ]);
     }
-
-    public function configureOptions(OptionsResolver $resolver): void
-    {
-        parent::configureOptions($resolver);
-        $resolver->setDefault('data_class', LabelProfile::class);
-        $resolver->setDefault('disable_options', false);
-    }
-}
\ No newline at end of file
+}
diff --git a/src/Form/LabelOptionsType.php b/src/Form/LabelOptionsType.php
index 9f35957e..e2152298 100644
--- a/src/Form/LabelOptionsType.php
+++ b/src/Form/LabelOptionsType.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Form;
 
-
 use App\Entity\LabelSystem\LabelOptions;
 use FOS\CKEditorBundle\Form\Type\CKEditorType;
 use Symfony\Component\Form\AbstractType;
@@ -40,7 +42,7 @@ class LabelOptionsType extends AbstractType
         $this->security = $security;
     }
 
-    public function buildForm(FormBuilderInterface $builder, array $options)
+    public function buildForm(FormBuilderInterface $builder, array $options): void
     {
         $builder->add('width', NumberType::class, [
             'label' => 'label_options.page_size.label',
@@ -49,7 +51,7 @@ class LabelOptionsType extends AbstractType
                 'placeholder' => 'label_options.width.placeholder',
                 'min' => 0,
                 'step' => 'any',
-            ]
+            ],
         ]);
         $builder->add('height', NumberType::class, [
             'label' => false,
@@ -58,7 +60,7 @@ class LabelOptionsType extends AbstractType
                 'placeholder' => 'label_options.height.placeholder',
                 'min' => 0,
                 'step' => 'any',
-            ]
+            ],
         ]);
 
         $builder->add('supported_element', ChoiceType::class, [
@@ -67,11 +69,11 @@ class LabelOptionsType extends AbstractType
                 'part.label' => 'part',
                 'part_lot.label' => 'part_lot',
                 'storelocation.label' => 'storelocation',
-            ]
+            ],
         ]);
 
         $builder->add('barcode_type', ChoiceType::class, [
-           'label' => 'label_options.barcode_type.label',
+            'label' => 'label_options.barcode_type.label',
             'empty_data' => 'none',
             'choices' => [
                 'label_options.barcode_type.none' => 'none',
@@ -82,10 +84,10 @@ class LabelOptionsType extends AbstractType
                 'label_options.barcode_type.datamatrix' => 'datamatrix',
             ],
             'group_by' => function ($choice, $key, $value) {
-                if (in_array($choice, ['qr', 'datamatrix'])) {
+                if (in_array($choice, ['qr', 'datamatrix'], true)) {
                     return 'label_options.barcode_type.2D';
                 }
-                if (in_array($choice, ['code39', 'code93', 'code128'])) {
+                if (in_array($choice, ['code39', 'code93', 'code128'], true)) {
                     return 'label_options.barcode_type.1D';
                 }
 
@@ -95,7 +97,6 @@ class LabelOptionsType extends AbstractType
                 'class' => 'selectpicker',
                 'data-live-search' => true,
             ],
-
         ]);
 
         $builder->add('lines', CKEditorType::class, [
@@ -126,17 +127,17 @@ class LabelOptionsType extends AbstractType
             'help_html' => true,
             'expanded' => true,
             'attr' => [
-                'class' => 'pt-2'
+                'class' => 'pt-2',
             ],
             'label_attr' => [
-                'class' => 'radio-custom radio-inline'
+                'class' => 'radio-custom radio-inline',
             ],
-            'disabled' => !$this->security->isGranted('@labels.use_twig')
+            'disabled' => ! $this->security->isGranted('@labels.use_twig'),
         ]);
     }
 
-    public function configureOptions(OptionsResolver $resolver)
+    public function configureOptions(OptionsResolver $resolver): void
     {
         $resolver->setDefault('data_class', LabelOptions::class);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Form/LabelSystem/LabelDialogType.php b/src/Form/LabelSystem/LabelDialogType.php
index 60f392c0..2c5bf343 100644
--- a/src/Form/LabelSystem/LabelDialogType.php
+++ b/src/Form/LabelSystem/LabelDialogType.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,11 +23,9 @@
 
 namespace App\Form\LabelSystem;
 
-
 use App\Form\LabelOptionsType;
 use App\Validator\Constraints\Misc\ValidRange;
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\Extension\Core\Type\NumberType;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\FormBuilderInterface;
@@ -40,7 +41,7 @@ class LabelDialogType extends AbstractType
         $this->security = $security;
     }
 
-    public function buildForm(FormBuilderInterface $builder, array $options)
+    public function buildForm(FormBuilderInterface $builder, array $options): void
     {
         $builder->add('target_id', TextType::class, [
             'required' => true,
@@ -53,18 +54,17 @@ class LabelDialogType extends AbstractType
 
         $builder->add('options', LabelOptionsType::class, [
             'label' => false,
-            'disabled' => !$this->security->isGranted('@labels.edit_options') || $options['disable_options'],
-
+            'disabled' => ! $this->security->isGranted('@labels.edit_options') || $options['disable_options'],
         ]);
         $builder->add('update', SubmitType::class, [
             'label' => 'label_generator.update',
         ]);
     }
 
-    public function configureOptions(OptionsResolver $resolver)
+    public function configureOptions(OptionsResolver $resolver): void
     {
         parent::configureOptions($resolver);
         $resolver->setDefault('mapped', false);
         $resolver->setDefault('disable_options', false);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Form/LabelSystem/ScanDialogType.php b/src/Form/LabelSystem/ScanDialogType.php
index fc269203..89dbf5bb 100644
--- a/src/Form/LabelSystem/ScanDialogType.php
+++ b/src/Form/LabelSystem/ScanDialogType.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Form\LabelSystem;
 
-
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
@@ -29,7 +31,7 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class ScanDialogType extends AbstractType
 {
-    public function buildForm(FormBuilderInterface $builder, array $options)
+    public function buildForm(FormBuilderInterface $builder, array $options): void
     {
         $builder->add('input', TextType::class, [
             'label' => 'scan_dialog.input',
@@ -40,12 +42,12 @@ class ScanDialogType extends AbstractType
         ]);
 
         $builder->add('submit', SubmitType::class, [
-            'label' => 'scan_dialog.submit'
+            'label' => 'scan_dialog.submit',
         ]);
     }
 
-    public function configureOptions(OptionsResolver $resolver)
+    public function configureOptions(OptionsResolver $resolver): void
     {
         $resolver->setDefault('mapped', false);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Helpers/LabelResponse.php b/src/Helpers/LabelResponse.php
index 510ff0b1..b60aa875 100644
--- a/src/Helpers/LabelResponse.php
+++ b/src/Helpers/LabelResponse.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,8 +23,6 @@
 
 namespace App\Helpers;
 
-
-use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -39,6 +40,7 @@ class LabelResponse extends Response
 
         $this->setAutoEtag();
         $this->setAutoLastModified();
+
         return $this;
     }
 
@@ -46,8 +48,7 @@ class LabelResponse extends Response
     {
         parent::prepare($request);
 
-        $this->headers->set('Content-Type','application/pdf');
-
+        $this->headers->set('Content-Type', 'application/pdf');
 
         if ('HTTP/1.0' !== $request->server->get('SERVER_PROTOCOL')) {
             $this->setProtocolVersion('1.1');
@@ -89,7 +90,7 @@ class LabelResponse extends Response
      */
     public function setContentDisposition($disposition, $filename, $filenameFallback = '')
     {
-        if ('' === $filenameFallback && (!preg_match('/^[\x20-\x7e]*$/', $filename) || false !== strpos($filename, '%'))) {
+        if ('' === $filenameFallback && (! preg_match('/^[\x20-\x7e]*$/', $filename) || false !== strpos($filename, '%'))) {
             $encoding = mb_detect_encoding($filename, null, true) ?: '8bit';
 
             for ($i = 0, $filenameLength = mb_strlen($filename, $encoding); $i < $filenameLength; ++$i) {
@@ -108,5 +109,4 @@ class LabelResponse extends Response
 
         return $this;
     }
-
-}
\ No newline at end of file
+}
diff --git a/src/Migrations/Version20200502161750.php b/src/Migrations/Version20200502161750.php
index 74be880a..837348dd 100644
--- a/src/Migrations/Version20200502161750.php
+++ b/src/Migrations/Version20200502161750.php
@@ -12,25 +12,25 @@ use Doctrine\Migrations\AbstractMigration;
  */
 final class Version20200502161750 extends AbstractMigration
 {
-    public function getDescription() : string
+    public function getDescription(): string
     {
         return '';
     }
 
-    public function up(Schema $schema) : void
+    public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
-        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+        $this->abortIf('mysql' !== $this->connection->getDatabasePlatform()->getName(), 'Migration can only be executed safely on \'mysql\'.');
 
         $this->addSql('CREATE TABLE label_profiles (id INT AUTO_INCREMENT NOT NULL, id_preview_attachement INT DEFAULT NULL, comment LONGTEXT NOT NULL, show_in_dropdown TINYINT(1) NOT NULL, name VARCHAR(255) NOT NULL, last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, options_width DOUBLE PRECISION NOT NULL, options_height DOUBLE PRECISION NOT NULL, options_barcode_type VARCHAR(255) NOT NULL, options_picture_type VARCHAR(255) NOT NULL, options_supported_element VARCHAR(255) NOT NULL, options_additional_css LONGTEXT NOT NULL, options_lines_mode VARCHAR(255) NOT NULL, options_lines LONGTEXT NOT NULL, INDEX IDX_C93E9CF56DEDCEC2 (id_preview_attachement), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
         $this->addSql('ALTER TABLE label_profiles ADD CONSTRAINT FK_C93E9CF56DEDCEC2 FOREIGN KEY (id_preview_attachement) REFERENCES `attachments` (id)');
         $this->addSql('ALTER TABLE log CHANGE level level TINYINT(4) NOT NULL');
     }
 
-    public function down(Schema $schema) : void
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
-        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+        $this->abortIf('mysql' !== $this->connection->getDatabasePlatform()->getName(), 'Migration can only be executed safely on \'mysql\'.');
 
         $this->addSql('DROP TABLE label_profiles');
         $this->addSql('ALTER TABLE log CHANGE level level TINYINT(1) DEFAULT NULL');
diff --git a/src/Repository/DBElementRepository.php b/src/Repository/DBElementRepository.php
index 0c84f1e5..f265f8c0 100644
--- a/src/Repository/DBElementRepository.php
+++ b/src/Repository/DBElementRepository.php
@@ -52,7 +52,7 @@ class DBElementRepository extends EntityRepository
 
     /**
      * Find all elements that match a list of IDs.
-     * @param  array  $ids
+     *
      * @return AbstractDBElement[]
      */
     public function getElementsFromIDArray(array $ids): array
diff --git a/src/Repository/LabelProfileRepository.php b/src/Repository/LabelProfileRepository.php
index fad62359..e4d6f784 100644
--- a/src/Repository/LabelProfileRepository.php
+++ b/src/Repository/LabelProfileRepository.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -23,22 +26,21 @@ namespace App\Repository;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\LabelSystem\LabelProfile;
 use App\Helpers\Trees\TreeViewNode;
-use Symfony\Contracts\Translation\TranslatorInterface;
 
 class LabelProfileRepository extends NamedDBElementRepository
 {
-
     /**
      * Find the profiles that are shown in the dropdown for the given type.
-     * You should maybe use the cached version of this in LabelProfileDropdownHelper
-     * @param  string  $type
+     * You should maybe use the cached version of this in LabelProfileDropdownHelper.
+     *
      * @return array
      */
     public function getDropdownProfiles(string $type): array
     {
-        if (!in_array($type, LabelOptions::SUPPORTED_ELEMENTS)) {
+        if (! in_array($type, LabelOptions::SUPPORTED_ELEMENTS, true)) {
             throw new \InvalidArgumentException('Invalid supported_element type given.');
         }
+
         return $this->findBy(['options.supported_element' => $type, 'show_in_dropdown' => true], ['name' => 'ASC']);
     }
 
@@ -62,9 +64,9 @@ class LabelProfileRepository extends NamedDBElementRepository
                 $type_children[] = $node;
             }
 
-            if (!empty($type_children)) {
+            if (! empty($type_children)) {
                 //Use default label e.g. 'part_label'. $$ marks that it will be translated in TreeViewGenerator
-                $tmp = new TreeViewNode('$$' . $type . '.label', null, $type_children);
+                $tmp = new TreeViewNode('$$'.$type.'.label', null, $type_children);
 
                 $result[] = $tmp;
             }
@@ -74,16 +76,19 @@ class LabelProfileRepository extends NamedDBElementRepository
     }
 
     /**
-     * Find all LabelProfiles that can be used with the given type
-     * @param  string  $type See LabelOptions::SUPPORTED_ELEMENTS for valid values.
-     * @param array $order_by The way the results should be sorted. By default ordered by
+     * Find all LabelProfiles that can be used with the given type.
+     *
+     * @param string $type     See LabelOptions::SUPPORTED_ELEMENTS for valid values.
+     * @param array  $order_by The way the results should be sorted. By default ordered by
+     *
      * @return array
      */
     public function findForSupportedElement(string $type, array $order_by = ['name' => 'ASC']): array
     {
-        if (!in_array($type, LabelOptions::SUPPORTED_ELEMENTS)) {
-           throw new \InvalidArgumentException('Invalid supported_element type given.');
+        if (! in_array($type, LabelOptions::SUPPORTED_ELEMENTS, true)) {
+            throw new \InvalidArgumentException('Invalid supported_element type given.');
         }
+
         return $this->findBy(['options.supported_element' => $type], $order_by);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Security/Voter/LabelProfileVoter.php b/src/Security/Voter/LabelProfileVoter.php
index d8abc7ea..837bbe90 100644
--- a/src/Security/Voter/LabelProfileVoter.php
+++ b/src/Security/Voter/LabelProfileVoter.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,13 +23,11 @@
 
 namespace App\Security\Voter;
 
-
 use App\Entity\LabelSystem\LabelProfile;
 use App\Entity\UserSystem\User;
 
 class LabelProfileVoter extends ExtendedVoter
 {
-
     protected const MAPPING = [
         'read' => 'read_profiles',
         'create' => 'create_profiles',
@@ -36,21 +37,15 @@ class LabelProfileVoter extends ExtendedVoter
         'revert_element' => 'revert_element',
     ];
 
-    /**
-     * @inheritDoc
-     */
     protected function voteOnUser($attribute, $subject, User $user): bool
     {
         return $this->resolver->inherit($user, 'labels', self::MAPPING[$attribute]) ?? false;
     }
 
-    /**
-     * @inheritDoc
-     */
     protected function supports($attribute, $subject)
     {
         if ($subject instanceof LabelProfile) {
-            if (!isset(self::MAPPING[$attribute])) {
+            if (! isset(self::MAPPING[$attribute])) {
                 return false;
             }
 
@@ -59,4 +54,4 @@ class LabelProfileVoter extends ExtendedVoter
 
         return false;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Security/Voter/OrderdetailVoter.php b/src/Security/Voter/OrderdetailVoter.php
index 256d406f..0d54d391 100644
--- a/src/Security/Voter/OrderdetailVoter.php
+++ b/src/Security/Voter/OrderdetailVoter.php
@@ -28,7 +28,9 @@ use App\Entity\UserSystem\User;
 
 class OrderdetailVoter extends ExtendedVoter
 {
-    /** @var string[] When this permsission are encountered, they are checked on part */
+    /**
+     * @var string[] When this permsission are encountered, they are checked on part
+     */
     protected const PART_PERMS = ['show_history', 'revert_element'];
 
     protected function voteOnUser($attribute, $subject, User $user): bool
diff --git a/src/Security/Voter/PartLotVoter.php b/src/Security/Voter/PartLotVoter.php
index 0e985e48..035d25b5 100644
--- a/src/Security/Voter/PartLotVoter.php
+++ b/src/Security/Voter/PartLotVoter.php
@@ -28,7 +28,9 @@ use App\Entity\UserSystem\User;
 
 class PartLotVoter extends ExtendedVoter
 {
-    /** @var string[] When this permsission are encountered, they are checked on part */
+    /**
+     * @var string[] When this permsission are encountered, they are checked on part
+     */
     protected const PART_PERMS = ['show_history', 'revert_element'];
 
     protected function voteOnUser($attribute, $subject, User $user): bool
diff --git a/src/Security/Voter/PricedetailVoter.php b/src/Security/Voter/PricedetailVoter.php
index d222df54..c6a9cbdc 100644
--- a/src/Security/Voter/PricedetailVoter.php
+++ b/src/Security/Voter/PricedetailVoter.php
@@ -28,7 +28,9 @@ use App\Entity\UserSystem\User;
 
 class PricedetailVoter extends ExtendedVoter
 {
-    /** @var string[] When this permsission are encountered, they are checked on part */
+    /**
+     * @var string[] When this permsission are encountered, they are checked on part
+     */
     protected const PART_PERMS = ['show_history', 'revert_element'];
 
     protected function voteOnUser($attribute, $subject, User $user): bool
diff --git a/src/Services/AmountFormatter.php b/src/Services/AmountFormatter.php
index 2dae342a..4cb7c36e 100644
--- a/src/Services/AmountFormatter.php
+++ b/src/Services/AmountFormatter.php
@@ -62,9 +62,9 @@ class AmountFormatter
     /**
      *  Formats the given value using the measurement unit and options.
      *
-     * @param float|string|int $value
-     * @param MeasurementUnit|null $unit The measurement unit, whose unit symbol should be used for formatting.
-     *                                If set to null, it is assumed that the part amount is measured in pieces.
+     * @param float|string|int     $value
+     * @param MeasurementUnit|null $unit  The measurement unit, whose unit symbol should be used for formatting.
+     *                                    If set to null, it is assumed that the part amount is measured in pieces.
      *
      * @return string The formatted string
      *
diff --git a/src/Services/EntityURLGenerator.php b/src/Services/EntityURLGenerator.php
index 96ac6ff1..5151a463 100644
--- a/src/Services/EntityURLGenerator.php
+++ b/src/Services/EntityURLGenerator.php
@@ -242,7 +242,7 @@ class EntityURLGenerator
             Currency::class => 'currency_edit',
             MeasurementUnit::class => 'measurement_unit_edit',
             Group::class => 'group_edit',
-            LabelProfile::class => 'label_profile_edit'
+            LabelProfile::class => 'label_profile_edit',
         ];
 
         return $this->urlGenerator->generate($this->mapToController($map, $entity), ['id' => $entity->getID()]);
@@ -272,7 +272,7 @@ class EntityURLGenerator
             Currency::class => 'currency_edit',
             MeasurementUnit::class => 'measurement_unit_edit',
             Group::class => 'group_edit',
-            LabelProfile::class => 'label_profile_edit'
+            LabelProfile::class => 'label_profile_edit',
         ];
 
         return $this->urlGenerator->generate($this->mapToController($map, $entity), ['id' => $entity->getID()]);
@@ -302,7 +302,7 @@ class EntityURLGenerator
             Currency::class => 'currency_new',
             MeasurementUnit::class => 'measurement_unit_new',
             Group::class => 'group_new',
-            LabelProfile::class => 'label_profile_new'
+            LabelProfile::class => 'label_profile_new',
         ];
 
         return $this->urlGenerator->generate($this->mapToController($map, $entity));
@@ -333,7 +333,7 @@ class EntityURLGenerator
             Currency::class => 'currency_clone',
             MeasurementUnit::class => 'measurement_unit_clone',
             Group::class => 'group_clone',
-            LabelProfile::class => 'label_profile_clone'
+            LabelProfile::class => 'label_profile_clone',
         ];
 
         return $this->urlGenerator->generate($this->mapToController($map, $entity), ['id' => $entity->getID()]);
@@ -376,7 +376,7 @@ class EntityURLGenerator
             Currency::class => 'currency_delete',
             MeasurementUnit::class => 'measurement_unit_delete',
             Group::class => 'group_delete',
-            LabelProfile::class => 'label_profile_delete'
+            LabelProfile::class => 'label_profile_delete',
         ];
 
         return $this->urlGenerator->generate($this->mapToController($map, $entity), ['id' => $entity->getID()]);
diff --git a/src/Services/LabelSystem/BarcodeGenerator.php b/src/Services/LabelSystem/BarcodeGenerator.php
index 70f68d27..4d82dc3b 100644
--- a/src/Services/LabelSystem/BarcodeGenerator.php
+++ b/src/Services/LabelSystem/BarcodeGenerator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -40,18 +43,23 @@ final class BarcodeGenerator
         switch ($options->getBarcodeType()) {
             case 'qr':
                 $type = 'QRCODE';
+
                 break;
             case 'datamatrix':
                 $type = 'DATAMATRIX';
+
                 break;
             case 'code39':
                 $type = 'C39';
+
                 break;
             case 'code93':
                 $type = 'C93';
+
                 break;
             case 'code128':
                 $type = 'C128A';
+
                 break;
             case 'none':
                 return null;
@@ -80,5 +88,4 @@ final class BarcodeGenerator
                 throw new \InvalidArgumentException('Unknown label type!');
         }
     }
-
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/Barcodes/BarcodeContentGenerator.php b/src/Services/LabelSystem/Barcodes/BarcodeContentGenerator.php
index 90838d9a..f4260563 100644
--- a/src/Services/LabelSystem/Barcodes/BarcodeContentGenerator.php
+++ b/src/Services/LabelSystem/Barcodes/BarcodeContentGenerator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,24 +23,18 @@
 
 namespace App\Services\LabelSystem\Barcodes;
 
-
 use App\Entity\Base\AbstractDBElement;
-use App\Entity\Parts\Manufacturer;
 use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
-use App\Entity\Parts\Supplier;
-use App\Exceptions\EntityNotSupportedException;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 final class BarcodeContentGenerator
 {
-    private $urlGenerator;
-
     public const PREFIX_MAP = [
         Part::class => 'P',
         PartLot::class => 'L',
-        Storelocation::class => 'S'
+        Storelocation::class => 'S',
     ];
 
     private const URL_MAP = [
@@ -45,6 +42,7 @@ final class BarcodeContentGenerator
         PartLot::class => 'lot',
         Storelocation::class => 'location',
     ];
+    private $urlGenerator;
 
     public function __construct(UrlGeneratorInterface $urlGenerator)
     {
@@ -53,7 +51,7 @@ final class BarcodeContentGenerator
 
     /**
      * Generates a fixed URL to the given Element that can be embedded in a 2D code (e.g. QR code).
-     * @param  AbstractDBElement  $target
+     *
      * @return string
      */
     public function getURLContent(AbstractDBElement $target): string
@@ -69,15 +67,16 @@ final class BarcodeContentGenerator
 
     /**
      * Returns a Code that can be used in a 1D barcode.
-     * The return value has a format of "L0123"
-     * @param  AbstractDBElement  $target
+     * The return value has a format of "L0123".
+     *
      * @return string
      */
     public function get1DBarcodeContent(AbstractDBElement $target): string
     {
         $prefix = $this->classToString(self::PREFIX_MAP, $target);
         $id = sprintf('%04d', $target->getID() ?? 0);
-        return $prefix  . $id;
+
+        return $prefix.$id;
     }
 
     private function classToString(array $map, object $target): string
@@ -87,12 +86,12 @@ final class BarcodeContentGenerator
             return $map[$class];
         }
 
-        foreach($map as $class => $string) {
+        foreach ($map as $class => $string) {
             if (is_a($target, $class)) {
                 return $string;
             }
         }
 
-        throw new \InvalidArgumentException('Unknown object class ' . get_class($target));
+        throw new \InvalidArgumentException('Unknown object class '.get_class($target));
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/Barcodes/BarcodeExampleElementsGenerator.php b/src/Services/LabelSystem/Barcodes/BarcodeExampleElementsGenerator.php
index 96644960..118b1a24 100644
--- a/src/Services/LabelSystem/Barcodes/BarcodeExampleElementsGenerator.php
+++ b/src/Services/LabelSystem/Barcodes/BarcodeExampleElementsGenerator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -44,39 +47,6 @@ final class BarcodeExampleElementsGenerator
         }
     }
 
-    private function getStorelocation(): Storelocation
-    {
-        $storelocation = new Storelocation();
-        $storelocation->setName('Location 1');
-        $storelocation->setComment('Example comment');
-        $storelocation->updatedTimestamps();
-
-        $parent = new Storelocation();
-        $parent->setName('Parent');
-
-        $storelocation->setParent($parent);
-
-        return $storelocation;
-    }
-
-    private function getStructuralData(string $class): AbstractStructuralDBElement
-    {
-        if (!is_a($class, AbstractStructuralDBElement::class, true)) {
-           throw new \InvalidArgumentException('$class must be an child of AbstractStructuralDBElement');
-        }
-
-        /** @var AbstractStructuralDBElement $parent */
-        $parent = new $class();
-        $parent->setName('Example');
-
-        /** @var AbstractStructuralDBElement $child */
-        $child = new $class();
-        $child->setName((new \ReflectionClass($class))->getShortName());
-        $child->setParent($parent);
-
-        return $child;
-    }
-
     public function getExamplePart(): Part
     {
         $part = new Part();
@@ -98,7 +68,6 @@ final class BarcodeExampleElementsGenerator
         $part->setMinAmount(100);
         $part->setNeedsReview(true);
 
-
         return $part;
     }
 
@@ -115,4 +84,37 @@ final class BarcodeExampleElementsGenerator
 
         return $lot;
     }
-}
\ No newline at end of file
+
+    private function getStorelocation(): Storelocation
+    {
+        $storelocation = new Storelocation();
+        $storelocation->setName('Location 1');
+        $storelocation->setComment('Example comment');
+        $storelocation->updatedTimestamps();
+
+        $parent = new Storelocation();
+        $parent->setName('Parent');
+
+        $storelocation->setParent($parent);
+
+        return $storelocation;
+    }
+
+    private function getStructuralData(string $class): AbstractStructuralDBElement
+    {
+        if (! is_a($class, AbstractStructuralDBElement::class, true)) {
+            throw new \InvalidArgumentException('$class must be an child of AbstractStructuralDBElement');
+        }
+
+        /** @var AbstractStructuralDBElement $parent */
+        $parent = new $class();
+        $parent->setName('Example');
+
+        /** @var AbstractStructuralDBElement $child */
+        $child = new $class();
+        $child->setName((new \ReflectionClass($class))->getShortName());
+        $child->setParent($parent);
+
+        return $child;
+    }
+}
diff --git a/src/Services/LabelSystem/Barcodes/BarcodeNormalizer.php b/src/Services/LabelSystem/Barcodes/BarcodeNormalizer.php
index 2170bcaf..e8c69a8f 100644
--- a/src/Services/LabelSystem/Barcodes/BarcodeNormalizer.php
+++ b/src/Services/LabelSystem/Barcodes/BarcodeNormalizer.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem\Barcodes;
 
-
 final class BarcodeNormalizer
 {
     private const PREFIX_TYPE_MAP = [
@@ -31,8 +33,8 @@ final class BarcodeNormalizer
 
     /**
      * Parses barcode content and normalizes it.
-     * Returns an array in the format ['part', 1]: First entry contains element type, second the ID of the element
-     * @param  string  $input
+     * Returns an array in the format ['part', 1]: First entry contains element type, second the ID of the element.
+     *
      * @return array
      */
     public function normalizeBarcodeContent(string $input): array
@@ -53,9 +55,10 @@ final class BarcodeNormalizer
             $prefix = $matches[1];
             $id = (int) $matches[2];
 
-            if (!isset(self::PREFIX_TYPE_MAP[$prefix])) {
-                throw new \InvalidArgumentException('Unknown prefix ' . $prefix);
+            if (! isset(self::PREFIX_TYPE_MAP[$prefix])) {
+                throw new \InvalidArgumentException('Unknown prefix '.$prefix);
             }
+
             return [self::PREFIX_TYPE_MAP[$prefix], $id];
         }
 
@@ -64,9 +67,10 @@ final class BarcodeNormalizer
             $prefix = $matches[1];
             $id = (int) $matches[2];
 
-            if (!isset(self::PREFIX_TYPE_MAP[$prefix])) {
-                throw new \InvalidArgumentException('Unknown prefix ' . $prefix);
+            if (! isset(self::PREFIX_TYPE_MAP[$prefix])) {
+                throw new \InvalidArgumentException('Unknown prefix '.$prefix);
             }
+
             return [self::PREFIX_TYPE_MAP[$prefix], $id];
         }
 
@@ -80,7 +84,6 @@ final class BarcodeNormalizer
             return ['part', (int) $matches[1]];
         }
 
-
         throw new \InvalidArgumentException('Unknown barcode format!');
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/Barcodes/BarcodeRedirector.php b/src/Services/LabelSystem/Barcodes/BarcodeRedirector.php
index 8a3455f3..5cd8da08 100644
--- a/src/Services/LabelSystem/Barcodes/BarcodeRedirector.php
+++ b/src/Services/LabelSystem/Barcodes/BarcodeRedirector.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem\Barcodes;
 
-
 use App\Entity\Parts\PartLot;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityNotFoundException;
@@ -31,7 +33,6 @@ final class BarcodeRedirector
     private $urlGenerator;
     private $em;
 
-
     public function __construct(UrlGeneratorInterface $urlGenerator, EntityManagerInterface $entityManager)
     {
         $this->urlGenerator = $urlGenerator;
@@ -39,10 +40,13 @@ final class BarcodeRedirector
     }
 
     /**
-     * Determines the URL to which the user should be redirected, when scanning a QR code
-     * @param  string  $type The type of the element that was scanned (e.g. 'part', 'lot', etc.)
-     * @param  int  $id The ID of the element that was scanned
+     * Determines the URL to which the user should be redirected, when scanning a QR code.
+     *
+     * @param string $type The type of the element that was scanned (e.g. 'part', 'lot', etc.)
+     * @param int    $id   The ID of the element that was scanned
+     *
      * @return string The URL to which should be redirected.
+     *
      * @throws EntityNotFoundException
      */
     public function getRedirectURL(string $type, int $id): string
@@ -53,7 +57,7 @@ final class BarcodeRedirector
             case 'lot':
                 //Try to determine the part to the given lot
                 $lot = $this->em->find(PartLot::class, $id);
-                if ($lot === null) {
+                if (null === $lot) {
                     throw new EntityNotFoundException();
                 }
 
@@ -63,7 +67,7 @@ final class BarcodeRedirector
                 return $this->urlGenerator->generate('part_list_store_location', ['id' => $id]);
 
             default:
-                throw new \InvalidArgumentException('Unknown $type: ' . $type);
+                throw new \InvalidArgumentException('Unknown $type: '.$type);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/LabelGenerator.php b/src/Services/LabelSystem/LabelGenerator.php
index 8c8dd70e..f3049166 100644
--- a/src/Services/LabelSystem/LabelGenerator.php
+++ b/src/Services/LabelSystem/LabelGenerator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,15 +23,11 @@
 
 namespace App\Services\LabelSystem;
 
-
-use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
-use App\Services\ElementTypeNameGenerator;
 use Dompdf\Dompdf;
-use Twig\Environment;
 
 final class LabelGenerator
 {
@@ -48,44 +47,43 @@ final class LabelGenerator
     }
 
     /**
-     * @param  LabelOptions  $options
-     * @param  object|object[]  $elements An element or an array of elements for which labels should be generated
+     * @param object|object[] $elements An element or an array of elements for which labels should be generated
+     *
      * @return string
      */
     public function generateLabel(LabelOptions $options, $elements): string
     {
-        if (!is_array($elements) && !is_object($elements)) {
+        if (! is_array($elements) && ! is_object($elements)) {
             throw new \InvalidArgumentException('$element must be an object or an array of objects!');
         }
 
-        if (!is_array($elements)) {
+        if (! is_array($elements)) {
             $elements = [$elements];
         }
 
         foreach ($elements as $element) {
-            if (!$this->supports($options, $element)) {
+            if (! $this->supports($options, $element)) {
                 throw new \InvalidArgumentException('The given options are not compatible with the given element!');
             }
         }
 
-
         $dompdf = new Dompdf();
         $dompdf->setPaper($this->mmToPointsArray($options->getWidth(), $options->getHeight()));
         $dompdf->loadHtml($this->labelHTMLGenerator->getLabelHTML($options, $elements));
         $dompdf->render();
+
         return $dompdf->output();
     }
 
     /**
      * Check if the given LabelOptions can be used with $element.
-     * @param  LabelOptions  $options
-     * @param  object  $element
+     *
      * @return bool
      */
     public function supports(LabelOptions $options, object $element)
     {
         $supported_type = $options->getSupportedElement();
-        if (!isset(static::CLASS_SUPPORT_MAPPING[$supported_type])) {
+        if (! isset(static::CLASS_SUPPORT_MAPPING[$supported_type])) {
             throw new \InvalidArgumentException('Supported type name of the Label options not known!');
         }
 
@@ -93,13 +91,15 @@ final class LabelGenerator
     }
 
     /**
-     * Converts width and height given in mm to an size array, that can be used by DOMPDF for page size
-     * @param  float  $width The width of the paper
-     * @param  float  $height The height of the paper
+     * Converts width and height given in mm to an size array, that can be used by DOMPDF for page size.
+     *
+     * @param float $width  The width of the paper
+     * @param float $height The height of the paper
+     *
      * @return float[]
      */
     public function mmToPointsArray(float $width, float $height): array
     {
         return [0.0, 0.0, $width * self::MM_TO_POINTS_FACTOR, $height * self::MM_TO_POINTS_FACTOR];
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/LabelHTMLGenerator.php b/src/Services/LabelSystem/LabelHTMLGenerator.php
index ef161940..5076971b 100644
--- a/src/Services/LabelSystem/LabelHTMLGenerator.php
+++ b/src/Services/LabelSystem/LabelHTMLGenerator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -24,11 +27,9 @@ use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Exceptions\TwigModeException;
 use App\Services\ElementTypeNameGenerator;
-use App\Services\LabelSystem\Barcodes\BarcodeContentGenerator;
 use Symfony\Component\Security\Core\Security;
 use Twig\Environment;
 use Twig\Error\Error;
-use Twig\Error\SyntaxError;
 
 final class LabelHTMLGenerator
 {
@@ -60,14 +61,14 @@ final class LabelHTMLGenerator
 
         $twig_elements = [];
 
-        if ($options->getLinesMode() === 'twig') {
+        if ('twig' === $options->getLinesMode()) {
             $sandboxed_twig = $this->sandboxedTwigProvider->getTwig($options);
             $current_user = $this->security->getUser();
         }
 
         $page = 1;
         foreach ($elements as $element) {
-            if ($options->getLinesMode() === 'twig' && isset($sandboxed_twig) && isset($current_user)) {
+            if ('twig' === $options->getLinesMode() && isset($sandboxed_twig) && isset($current_user)) {
                 try {
                     $lines = $sandboxed_twig->render(
                         'lines',
@@ -92,10 +93,9 @@ final class LabelHTMLGenerator
                 'barcode_content' => $this->barcodeGenerator->getContent($options, $element),
             ];
 
-            $page++;
+            ++$page;
         }
 
-
         return $this->twig->render('LabelSystem/labels/base_label.html.twig', [
             'meta_title' => $this->getPDFTitle($options, $elements[0]),
             'elements' => $twig_elements,
@@ -103,8 +103,7 @@ final class LabelHTMLGenerator
         ]);
     }
 
-
-    protected function getPDFTitle(LabelOptions $options, object $element)
+    private function getPDFTitle(LabelOptions $options, object $element)
     {
         if ($element instanceof NamedElementInterface) {
             return $this->elementTypeNameGenerator->getTypeNameCombination($element, false);
@@ -112,4 +111,4 @@ final class LabelHTMLGenerator
 
         return 'Part-DB label';
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/LabelProfileDropdownHelper.php b/src/Services/LabelSystem/LabelProfileDropdownHelper.php
index 21c33592..6dc116f9 100644
--- a/src/Services/LabelSystem/LabelProfileDropdownHelper.php
+++ b/src/Services/LabelSystem/LabelProfileDropdownHelper.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem;
 
-
 use App\Entity\LabelSystem\LabelProfile;
 use App\Repository\LabelProfileRepository;
 use App\Services\UserCacheKeyGenerator;
@@ -44,7 +46,7 @@ final class LabelProfileDropdownHelper
     public function getDropdownProfiles(string $type): array
     {
         $secure_class_name = str_replace('\\', '_', LabelProfile::class);
-        $key = 'profile_dropdown_'.$this->keyGenerator->generateKey().'_'.$secure_class_name . '_' . $type;
+        $key = 'profile_dropdown_'.$this->keyGenerator->generateKey().'_'.$secure_class_name.'_'.$type;
 
         /** @var LabelProfileRepository $repo */
         $repo = $this->entityManager->getRepository(LabelProfile::class);
@@ -56,4 +58,4 @@ final class LabelProfileDropdownHelper
             return $repo->getDropdownProfiles($type);
         });
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/LabelTextReplacer.php b/src/Services/LabelSystem/LabelTextReplacer.php
index abf4c401..1413d7ab 100644
--- a/src/Services/LabelSystem/LabelTextReplacer.php
+++ b/src/Services/LabelSystem/LabelTextReplacer.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -25,7 +28,6 @@ use App\Services\LabelSystem\PlaceholderProviders\PlaceholderProviderInterface;
 /**
  * This service replaces the Placeholders of the user provided lines with the proper informations.
  * It uses the PlaceholderProviders provided by PlaceholderProviderInterface classes.
- * @package App\Services\LabelSystem
  */
 final class LabelTextReplacer
 {
@@ -39,16 +41,18 @@ final class LabelTextReplacer
     /**
      * Determine the replacement for a single placeholder. It is iterated over all Replacement Providers.
      * If the given string is not a placeholder or the placeholder is not known, it will be returned unchanged.
-     * @param  string  $placeholder The placeholder that should be replaced. (e.g. '%%PLACEHOLDER%%')
-     * @param  object  $target The object that should be used for the placeholder info source.
-     * @return string  If the placeholder was valid, the replaced info. Otherwise the passed string.
+     *
+     * @param string $placeholder The placeholder that should be replaced. (e.g. '%%PLACEHOLDER%%')
+     * @param object $target      The object that should be used for the placeholder info source.
+     *
+     * @return string If the placeholder was valid, the replaced info. Otherwise the passed string.
      */
     public function handlePlaceholder(string $placeholder, object $target): string
     {
         foreach ($this->providers as $provider) {
             /** @var PlaceholderProviderInterface $provider */
             $ret = $provider->replace($placeholder, $target);
-            if ($ret !== null) {
+            if (null !== $ret) {
                 return $ret;
             }
         }
@@ -58,8 +62,10 @@ final class LabelTextReplacer
 
     /**
      * Replaces all placeholders in the input lines.
-     * @param  string  $lines The input lines that should be replaced
-     * @param  object  $target The object that should be used as source for the informations.
+     *
+     * @param string $lines  The input lines that should be replaced
+     * @param object $target The object that should be used as source for the informations.
+     *
      * @return string The Lines with replaced informations.
      */
     public function replace(string $lines, object $target): string
@@ -72,4 +78,4 @@ final class LabelTextReplacer
 
         return preg_replace_callback_array($patterns, $lines);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/AbstractDBElementProvider.php b/src/Services/LabelSystem/PlaceholderProviders/AbstractDBElementProvider.php
index 1b60dfd3..734edcf9 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/AbstractDBElementProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/AbstractDBElementProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 use App\Entity\Base\AbstractDBElement;
 use App\Services\ElementTypeNameGenerator;
 
@@ -33,23 +35,18 @@ final class AbstractDBElementProvider implements PlaceholderProviderInterface
         $this->elementTypeNameGenerator = $elementTypeNameGenerator;
     }
 
-    /**
-     * @inheritDoc
-     */
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
         if ($label_target instanceof AbstractDBElement) {
-
-            if ($placeholder === '[[TYPE]]') {
+            if ('[[TYPE]]' === $placeholder) {
                 return $this->elementTypeNameGenerator->getLocalizedTypeLabel($label_target);
             }
 
-            if ($placeholder === '[[ID]]') {
+            if ('[[ID]]' === $placeholder) {
                 return (string) ($label_target->getID() ?? 'unknown');
             }
-
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/GlobalProviders.php b/src/Services/LabelSystem/PlaceholderProviders/GlobalProviders.php
index 3b6093e0..919ba58c 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/GlobalProviders.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/GlobalProviders.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 use App\Entity\UserSystem\User;
 use IntlDateFormatter;
 use Locale;
@@ -28,11 +30,9 @@ use Symfony\Component\Security\Core\Security;
 
 /**
  * Provides Placeholders for infos about global infos like Installation name or datetimes.
- * @package App\Services\LabelSystem\PlaceholderProviders
  */
 final class GlobalProviders implements PlaceholderProviderInterface
 {
-
     private $partdb_title;
     private $security;
 
@@ -42,34 +42,32 @@ final class GlobalProviders implements PlaceholderProviderInterface
         $this->security = $security;
     }
 
-    /**
-     * @inheritDoc
-     */
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
-        if ($placeholder === "[[INSTALL_NAME]]") {
+        if ('[[INSTALL_NAME]]' === $placeholder) {
             return $this->partdb_title;
         }
 
-
         $user = $this->security->getUser();
-        if ($placeholder === "[[USERNAME]]") {
+        if ('[[USERNAME]]' === $placeholder) {
             if ($user instanceof User) {
                 return $user->getName();
             }
+
             return 'anonymous';
         }
 
-        if ($placeholder === "[[USERNAME_FULL]]") {
+        if ('[[USERNAME_FULL]]' === $placeholder) {
             if ($user instanceof User) {
                 return $user->getFullName(true);
             }
+
             return 'anonymous';
         }
 
         $now = new \DateTime();
 
-        if ($placeholder === '[[DATETIME]]') {
+        if ('[[DATETIME]]' === $placeholder) {
             $formatter = IntlDateFormatter::create(
                 Locale::getDefault(),
                 IntlDateFormatter::SHORT,
@@ -80,7 +78,7 @@ final class GlobalProviders implements PlaceholderProviderInterface
             return $formatter->format($now);
         }
 
-        if ($placeholder === '[[DATE]]') {
+        if ('[[DATE]]' === $placeholder) {
             $formatter = IntlDateFormatter::create(
                 Locale::getDefault(),
                 IntlDateFormatter::SHORT,
@@ -91,7 +89,7 @@ final class GlobalProviders implements PlaceholderProviderInterface
             return $formatter->format($now);
         }
 
-        if ($placeholder === '[[TIME]]') {
+        if ('[[TIME]]' === $placeholder) {
             $formatter = IntlDateFormatter::create(
                 Locale::getDefault(),
                 IntlDateFormatter::NONE,
@@ -104,4 +102,4 @@ final class GlobalProviders implements PlaceholderProviderInterface
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/NamedElementProvider.php b/src/Services/LabelSystem/PlaceholderProviders/NamedElementProvider.php
index fdaf6031..ca77f83d 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/NamedElementProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/NamedElementProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,21 +23,16 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 use App\Entity\Contracts\NamedElementInterface;
 
 final class NamedElementProvider implements PlaceholderProviderInterface
 {
-
-    /**
-     * @inheritDoc
-     */
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
-        if ($label_target instanceof NamedElementInterface && $placeholder === '[[NAME]]') {
+        if ($label_target instanceof NamedElementInterface && '[[NAME]]' === $placeholder) {
             return $label_target->getName();
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/PartLotProvider.php b/src/Services/LabelSystem/PlaceholderProviders/PartLotProvider.php
index 0635a91c..38dc9cf7 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/PartLotProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/PartLotProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 use App\Entity\Parts\PartLot;
 use App\Services\AmountFormatter;
 use App\Services\LabelSystem\LabelTextReplacer;
@@ -41,20 +43,20 @@ final class PartLotProvider implements PlaceholderProviderInterface
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
         if ($label_target instanceof PartLot) {
-            if ($placeholder === '[[LOT_ID]]') {
+            if ('[[LOT_ID]]' === $placeholder) {
                 return $label_target->getID() ?? 'unknown';
             }
 
-            if ($placeholder === '[[LOT_NAME]]') {
+            if ('[[LOT_NAME]]' === $placeholder) {
                 return $label_target->getName();
             }
 
-            if ($placeholder === '[[LOT_COMMENT]]') {
+            if ('[[LOT_COMMENT]]' === $placeholder) {
                 return $label_target->getComment();
             }
 
-            if ($placeholder === '[[EXPIRATION_DATE]]') {
-                if ($label_target->getExpirationDate() === null) {
+            if ('[[EXPIRATION_DATE]]' === $placeholder) {
+                if (null === $label_target->getExpirationDate()) {
                     return '';
                 }
                 $formatter = IntlDateFormatter::create(
@@ -67,25 +69,25 @@ final class PartLotProvider implements PlaceholderProviderInterface
                 return $formatter->format($label_target->getExpirationDate());
             }
 
-            if ($placeholder === '[[AMOUNT]]') {
+            if ('[[AMOUNT]]' === $placeholder) {
                 if ($label_target->isInstockUnknown()) {
                     return '?';
                 }
+
                 return $this->amountFormatter->format($label_target->getAmount(), $label_target->getPart()->getPartUnit());
             }
 
-            if ($placeholder === '[[LOCATION]]') {
+            if ('[[LOCATION]]' === $placeholder) {
                 return $label_target->getStorageLocation() ? $label_target->getStorageLocation()->getName() : '';
             }
 
-            if ($placeholder === '[[LOCATION_FULL]]') {
+            if ('[[LOCATION_FULL]]' === $placeholder) {
                 return $label_target->getStorageLocation() ? $label_target->getStorageLocation()->getFullPath() : '';
             }
 
-
             return $this->labelTextReplacer->handlePlaceholder($placeholder, $label_target->getPart());
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/PartProvider.php b/src/Services/LabelSystem/PlaceholderProviders/PartProvider.php
index b6fb5e02..3098c1cc 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/PartProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/PartProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,14 +23,12 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 use App\Entity\Parts\Part;
 use App\Services\SIFormatter;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 final class PartProvider implements PlaceholderProviderInterface
 {
-
     private $siFormatter;
     private $translator;
 
@@ -37,76 +38,74 @@ final class PartProvider implements PlaceholderProviderInterface
         $this->translator = $translator;
     }
 
-    /**
-     * @inheritDoc
-     */
     public function replace(string $placeholder, object $part, array $options = []): ?string
     {
-        if (!$part instanceof Part) {
+        if (! $part instanceof Part) {
             return null;
         }
 
-        if ($placeholder === '[[CATEGORY]]') {
+        if ('[[CATEGORY]]' === $placeholder) {
             return $part->getCategory() ? $part->getCategory()->getName() : '';
         }
 
-        if ($placeholder === '[[CATEGORY_FULL]]') {
+        if ('[[CATEGORY_FULL]]' === $placeholder) {
             return $part->getCategory() ? $part->getCategory()->getFullPath() : '';
         }
 
-        if ($placeholder === '[[MANUFACTURER]]') {
+        if ('[[MANUFACTURER]]' === $placeholder) {
             return $part->getManufacturer() ? $part->getManufacturer()->getName() : '';
         }
 
-        if ($placeholder === '[[MANUFACTURER_FULL]]') {
+        if ('[[MANUFACTURER_FULL]]' === $placeholder) {
             return $part->getManufacturer() ? $part->getManufacturer()->getFullPath() : '';
         }
 
-        if ($placeholder === '[[FOOTPRINT]]') {
+        if ('[[FOOTPRINT]]' === $placeholder) {
             return $part->getFootprint() ? $part->getFootprint()->getName() : '';
         }
 
-        if ($placeholder === '[[FOOTPRINT_FULL]]') {
+        if ('[[FOOTPRINT_FULL]]' === $placeholder) {
             return $part->getFootprint() ? $part->getFootprint()->getFullPath() : '';
         }
 
-        if ($placeholder === '[[MASS]]') {
+        if ('[[MASS]]' === $placeholder) {
             return $part->getMass() ? $this->siFormatter->format($part->getMass(), 'g', 1) : '';
         }
 
-        if ($placeholder === '[[MPN]]') {
+        if ('[[MPN]]' === $placeholder) {
             return $part->getManufacturerProductNumber();
         }
 
-        if ($placeholder === '[[TAGS]]') {
+        if ('[[TAGS]]' === $placeholder) {
             return $part->getTags();
         }
 
-        if ($placeholder === '[[M_STATUS]]') {
-            if ($part->getManufacturingStatus() === '') {
+        if ('[[M_STATUS]]' === $placeholder) {
+            if ('' === $part->getManufacturingStatus()) {
                 return '';
             }
-            return $this->translator->trans('m_status.' . $part->getManufacturingStatus());
+
+            return $this->translator->trans('m_status.'.$part->getManufacturingStatus());
         }
 
         $parsedown = new \Parsedown();
 
-        if ($placeholder === '[[DESCRIPTION]]') {
+        if ('[[DESCRIPTION]]' === $placeholder) {
             return $parsedown->line($part->getDescription());
         }
 
-        if ($placeholder === '[[DESCRIPTION_T]]') {
+        if ('[[DESCRIPTION_T]]' === $placeholder) {
             return strip_tags($parsedown->line($part->getDescription()));
         }
 
-        if ($placeholder === '[[COMMENT]]') {
+        if ('[[COMMENT]]' === $placeholder) {
             return $parsedown->line($part->getComment());
         }
 
-        if ($placeholder === '[[COMMENT_T]]') {
+        if ('[[COMMENT_T]]' === $placeholder) {
             return strip_tags($parsedown->line($part->getComment()));
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/PlaceholderProviderInterface.php b/src/Services/LabelSystem/PlaceholderProviders/PlaceholderProviderInterface.php
index 4bf62049..cb259dcc 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/PlaceholderProviderInterface.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/PlaceholderProviderInterface.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,17 +23,17 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
 interface PlaceholderProviderInterface
 {
-
     /**
      * Determines the real value of this placeholder.
      * If the placeholder is not supported, null must be returned.
-     * @param  string  $placeholder The placeholder (e.g. "%%PLACEHOLDER%%") that should be replaced
-     * @param  object  $label_target The object that is targeted by the label
-     * @param  array   $options  A list of options that can be used to specify the generated output further.
+     *
+     * @param string $placeholder  The placeholder (e.g. "%%PLACEHOLDER%%") that should be replaced
+     * @param object $label_target The object that is targeted by the label
+     * @param array  $options      A list of options that can be used to specify the generated output further.
+     *
      * @return string|null The real value of this placeholder, null if not supported.
      */
     public function replace(string $placeholder, object $label_target, array $options = []): ?string;
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/StructuralDBElementProvider.php b/src/Services/LabelSystem/PlaceholderProviders/StructuralDBElementProvider.php
index 6a643c64..52e550c5 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/StructuralDBElementProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/StructuralDBElementProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,33 +23,30 @@
 
 namespace App\Services\LabelSystem\PlaceholderProviders;
 
-
-use App\Entity\Base\AbstractDBElement;
 use App\Entity\Base\AbstractStructuralDBElement;
 
 final class StructuralDBElementProvider implements PlaceholderProviderInterface
 {
-
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
         if ($label_target instanceof AbstractStructuralDBElement) {
-            if ($placeholder === '[[COMMENT]]') {
+            if ('[[COMMENT]]' === $placeholder) {
                 return $label_target->getComment();
             }
-            if ($placeholder === '[[COMMENT_T]]') {
+            if ('[[COMMENT_T]]' === $placeholder) {
                 return strip_tags($label_target->getComment());
             }
-            if ($placeholder === '[[FULL_PATH]]') {
+            if ('[[FULL_PATH]]' === $placeholder) {
                 return $label_target->getFullPath();
             }
-            if ($placeholder === '[[PARENT]]') {
+            if ('[[PARENT]]' === $placeholder) {
                 return $label_target->getParent() ? $label_target->getParent()->getName() : '';
             }
-            if ($placeholder === '[[PARENT_FULL_PATH]]') {
+            if ('[[PARENT_FULL_PATH]]' === $placeholder) {
                 return $label_target->getParent() ? $label_target->getParent()->getFullPath() : '';
             }
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/PlaceholderProviders/TimestampableElementProvider.php b/src/Services/LabelSystem/PlaceholderProviders/TimestampableElementProvider.php
index 4cb295cb..d4b5ac0a 100644
--- a/src/Services/LabelSystem/PlaceholderProviders/TimestampableElementProvider.php
+++ b/src/Services/LabelSystem/PlaceholderProviders/TimestampableElementProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -26,23 +29,18 @@ use Locale;
 
 final class TimestampableElementProvider implements PlaceholderProviderInterface
 {
-
-    /**
-     * @inheritDoc
-     */
     public function replace(string $placeholder, object $label_target, array $options = []): ?string
     {
         if ($label_target instanceof TimeStampableInterface) {
-            if ($placeholder === '[[LAST_MODIFIED]]') {
+            if ('[[LAST_MODIFIED]]' === $placeholder) {
                 return IntlDateFormatter::formatObject($label_target->getLastModified() ?? new \DateTime(), IntlDateFormatter::SHORT, Locale::getDefault());
             }
 
-            if ($placeholder === '[[CREATION_DATE]]') {
+            if ('[[CREATION_DATE]]' === $placeholder) {
                 return IntlDateFormatter::formatObject($label_target->getAddedDate() ?? new \DateTime(), IntlDateFormatter::SHORT, Locale::getDefault());
             }
-
         }
 
         return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/LabelSystem/SandboxedTwigProvider.php b/src/Services/LabelSystem/SandboxedTwigProvider.php
index 630820fe..c794741c 100644
--- a/src/Services/LabelSystem/SandboxedTwigProvider.php
+++ b/src/Services/LabelSystem/SandboxedTwigProvider.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,12 +23,10 @@
 
 namespace App\Services\LabelSystem;
 
-
 use App\Entity\Attachments\Attachment;
 use App\Entity\Attachments\AttachmentContainingDBElement;
 use App\Entity\Base\AbstractCompany;
 use App\Entity\Base\AbstractDBElement;
-use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\Base\AbstractStructuralDBElement;
 use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\Contracts\TimeStampableInterface;
@@ -45,7 +46,6 @@ use App\Twig\Sandbox\InheritanceSecurityPolicy;
 use Twig\Environment;
 use Twig\Extension\SandboxExtension;
 use Twig\Extra\Intl\IntlExtension;
-use Twig\Sandbox\SecurityPolicy;
 use Twig\Sandbox\SecurityPolicyInterface;
 
 final class SandboxedTwigProvider
@@ -58,7 +58,7 @@ final class SandboxedTwigProvider
         'reduce', 'replace', 'reverse', 'slice', 'sort', 'spaceless', 'split', 'striptags', 'timezone_name', 'title',
         'trim', 'upper', 'url_encode',
         //Part-DB specific filters:
-        'moneyFormat', 'siFormat', 'amountFormat'];
+        'moneyFormat', 'siFormat', 'amountFormat', ];
 
     private const ALLOWED_FUNCTIONS = ['date', 'html_classes', 'max', 'min', 'random', 'range'];
 
@@ -67,31 +67,30 @@ final class SandboxedTwigProvider
         AbstractDBElement::class => ['getID', '__toString'],
         TimeStampableInterface::class => ['getLastModified', 'getAddedDate'],
         AbstractStructuralDBElement::class => ['isChildOf', 'isRoot', 'getParent', 'getComment', 'getLevel',
-            'getFullPath', 'getPathArray', 'getChildren', 'isNotSelectable'],
+            'getFullPath', 'getPathArray', 'getChildren', 'isNotSelectable', ],
         AbstractCompany::class => ['getAddress', 'getPhoneNumber', 'getFaxNumber', 'getEmailAddress', 'getWebsite'],
         AttachmentContainingDBElement::class => ['getAttachments', 'getMasterPictureAttachment'],
         Attachment::class => ['isPicture', 'is3DModel', 'isExternal', 'isSecure', 'isBuiltIn', 'getExtension',
-            'getElement', 'getURL', 'getFilename', 'getAttachmentType', 'getShowInTable'],
+            'getElement', 'getURL', 'getFilename', 'getAttachmentType', 'getShowInTable', ],
         AbstractParameter::class => ['getFormattedValue', 'getGroup', 'getSymbol', 'getValueMin', 'getValueMax',
-            'getValueTypical', 'getUnit', 'getValueText'],
+            'getValueTypical', 'getUnit', 'getValueText', ],
         MeasurementUnit::class => ['getUnit', 'isInteger', 'useSIPrefix'],
         PartLot::class => ['isExpired', 'getDescription', 'getComment', 'getExpirationDate', 'getStorageLocation',
-            'getPart', 'isInstockUnknown', 'getAmount', 'getNeedsRefill'],
+            'getPart', 'isInstockUnknown', 'getAmount', 'getNeedsRefill', ],
         Storelocation::class => ['isFull', 'isOnlySinglePart', 'isLimitToExistingParts', 'getStorageType'],
         Supplier::class => ['getShippingCosts', 'getDefaultCurrency'],
         Part::class => ['isNeedsReview', 'getTags', 'getMass', 'getDescription', 'isFavorite', 'getCategory',
             'getFootprint', 'getPartLots', 'getPartUnit', 'useFloatAmount', 'getMinAmount', 'getAmountSum',
             'getManufacturerProductUrl', 'getCustomProductURL', 'getManufacturingStatus', 'getManufacturer',
-            'getManufacturerProductNumber', 'getOrderdetails', 'isObsolete'],
+            'getManufacturerProductNumber', 'getOrderdetails', 'isObsolete', ],
         Currency::class => ['getIsoCode', 'getInverseExchangeRate', 'getExchangeRate'],
         Orderdetail::class => ['getPart', 'getSupplier', 'getSupplierPartNr', 'getObsolete',
             'getPricedetails', 'findPriceForQty', ],
         Pricedetail::class => ['getOrderdetail', 'getPrice', 'getPricePerUnit', 'getPriceRelatedQuantity',
-            'getMinDiscountQuantity', 'getCurrency'],
+            'getMinDiscountQuantity', 'getCurrency', ],
         //Only allow very little information about users...
         User::class => ['isAnonymousUser', 'getUsername', 'getFullName', 'getFirstName', 'getLastName',
-            'getDepartment', 'getEmail']
-
+            'getDepartment', 'getEmail', ],
     ];
     private const ALLOWED_PROPERTIES = [];
 
@@ -104,14 +103,13 @@ final class SandboxedTwigProvider
 
     public function getTwig(LabelOptions $options): Environment
     {
-        if ($options->getLinesMode() !== 'twig') {
+        if ('twig' !== $options->getLinesMode()) {
             throw new \InvalidArgumentException('The LabelOptions must explicitly allow twig via lines_mode = "twig"!');
         }
 
-
         $loader = new \Twig\Loader\ArrayLoader([
-                                                   'lines' => $options->getLines(),
-                                               ]);
+            'lines' => $options->getLines(),
+        ]);
         $twig = new Environment($loader);
 
         //Second argument activate sandbox globally.
@@ -127,7 +125,7 @@ final class SandboxedTwigProvider
         return $twig;
     }
 
-    protected function getSecurityPolicy(): SecurityPolicyInterface
+    private function getSecurityPolicy(): SecurityPolicyInterface
     {
         return new InheritanceSecurityPolicy(
             self::ALLOWED_TAGS,
@@ -137,4 +135,4 @@ final class SandboxedTwigProvider
             self::ALLOWED_FUNCTIONS
         );
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/Misc/RangeParser.php b/src/Services/Misc/RangeParser.php
index 3714878f..ea857dbf 100644
--- a/src/Services/Misc/RangeParser.php
+++ b/src/Services/Misc/RangeParser.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -21,13 +24,15 @@
 namespace App\Services\Misc;
 
 /**
- * This Parser allows to parse number ranges like 1-3, 4, 5
+ * This Parser allows to parse number ranges like 1-3, 4, 5.
  */
 class RangeParser
 {
     /**
      * Converts the given range string to an array of all numbers in the given range.
-     * @param  string  $range_str A range string like '1-3, 5, 6'
+     *
+     * @param string $range_str A range string like '1-3, 5, 6'
+     *
      * @return int[] An array with all numbers from the range (e.g. [1, 2, 3, 5, 6]
      */
     public function parse(string $range_str): array
@@ -48,7 +53,7 @@ class RangeParser
             } elseif (empty($number)) { //Allow empty tokens
                 continue;
             } else {
-                throw new \InvalidArgumentException('Invalid range encoutered: ' . $number);
+                throw new \InvalidArgumentException('Invalid range encoutered: '.$number);
             }
         }
 
@@ -58,13 +63,16 @@ class RangeParser
 
     /**
      * Checks if the given string is a valid range.
-     * @param  string  $range_str The string that should be checked
+     *
+     * @param string $range_str The string that should be checked
+     *
      * @return bool True if the string is valid, false if not.
      */
     public function isValidRange(string $range_str): bool
     {
         try {
             $this->parse($range_str);
+
             return true;
         } catch (\InvalidArgumentException $exception) {
             return false;
@@ -86,9 +94,9 @@ class RangeParser
         $tmp = [];
         while ($min <= $max) {
             $tmp[] = $min;
-            $min++;
-        };
+            ++$min;
+        }
 
         return $tmp;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Services/SIFormatter.php b/src/Services/SIFormatter.php
index 0a736d84..4a60b8b1 100644
--- a/src/Services/SIFormatter.php
+++ b/src/Services/SIFormatter.php
@@ -105,6 +105,7 @@ class SIFormatter
      * @param float  $value    The value that should be converted
      * @param string $unit     The unit that should be appended after the prefix
      * @param int    $decimals the number of decimals (after decimal dot) that should be outputed
+     *
      * @return string The formatted value
      */
     public function format(float $value, string $unit = '', int $decimals = 2): string
diff --git a/src/Services/Trees/ToolsTreeBuilder.php b/src/Services/Trees/ToolsTreeBuilder.php
index 184359f8..f9388e11 100644
--- a/src/Services/Trees/ToolsTreeBuilder.php
+++ b/src/Services/Trees/ToolsTreeBuilder.php
@@ -211,7 +211,6 @@ class ToolsTreeBuilder
             );
         }
 
-
         return $nodes;
     }
 
diff --git a/src/Services/Trees/TreeViewGenerator.php b/src/Services/Trees/TreeViewGenerator.php
index 1aff2ab4..f0a406d2 100644
--- a/src/Services/Trees/TreeViewGenerator.php
+++ b/src/Services/Trees/TreeViewGenerator.php
@@ -118,13 +118,13 @@ class TreeViewGenerator
                 $item->addTag((string) \count($item->getNodes()));
             }
 
-            if (! empty($href_type) && $item->getId() !== null) {
+            if (! empty($href_type) && null !== $item->getId()) {
                 $entity = $this->em->getPartialReference($class, $item->getId());
                 $item->setHref($this->urlGenerator->getURL($entity, $href_type));
             }
 
             //Translate text if text starts with $$
-            if (substr($item->getText(), 0, 2) === '$$') {
+            if ('$$' === substr($item->getText(), 0, 2)) {
                 $item->setText($this->translator->trans(substr($item->getText(), 2)));
             }
         }
diff --git a/src/Twig/Sandbox/InheritanceSecurityPolicy.php b/src/Twig/Sandbox/InheritanceSecurityPolicy.php
index 3f0a32d8..5ad6d007 100644
--- a/src/Twig/Sandbox/InheritanceSecurityPolicy.php
+++ b/src/Twig/Sandbox/InheritanceSecurityPolicy.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of Twig.
  *
@@ -75,19 +77,19 @@ final class InheritanceSecurityPolicy implements SecurityPolicyInterface
     public function checkSecurity($tags, $filters, $functions): void
     {
         foreach ($tags as $tag) {
-            if (!\in_array($tag, $this->allowedTags)) {
+            if (! \in_array($tag, $this->allowedTags, true)) {
                 throw new SecurityNotAllowedTagError(sprintf('Tag "%s" is not allowed.', $tag), $tag);
             }
         }
 
         foreach ($filters as $filter) {
-            if (!\in_array($filter, $this->allowedFilters)) {
+            if (! \in_array($filter, $this->allowedFilters, true)) {
                 throw new SecurityNotAllowedFilterError(sprintf('Filter "%s" is not allowed.', $filter), $filter);
             }
         }
 
         foreach ($functions as $function) {
-            if (!\in_array($function, $this->allowedFunctions)) {
+            if (! \in_array($function, $this->allowedFunctions, true)) {
                 throw new SecurityNotAllowedFunctionError(sprintf('Function "%s" is not allowed.', $function), $function);
             }
         }
@@ -103,7 +105,7 @@ final class InheritanceSecurityPolicy implements SecurityPolicyInterface
         $method = strtr($method, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz');
         foreach ($this->allowedMethods as $class => $methods) {
             if ($obj instanceof $class) {
-                $allowed = \in_array($method, $methods);
+                $allowed = \in_array($method, $methods, true);
 
                 //CHANGED: Only break if we the method is allowed, otherwise try it on the other methods
                 if ($allowed) {
@@ -112,8 +114,9 @@ final class InheritanceSecurityPolicy implements SecurityPolicyInterface
             }
         }
 
-        if (!$allowed) {
+        if (! $allowed) {
             $class = \get_class($obj);
+
             throw new SecurityNotAllowedMethodError(sprintf('Calling "%s" method on a "%s" object is not allowed.', $method, $class), $class, $method);
         }
     }
@@ -123,7 +126,7 @@ final class InheritanceSecurityPolicy implements SecurityPolicyInterface
         $allowed = false;
         foreach ($this->allowedProperties as $class => $properties) {
             if ($obj instanceof $class) {
-                $allowed = \in_array($property, \is_array($properties) ? $properties : [$properties]);
+                $allowed = \in_array($property, \is_array($properties) ? $properties : [$properties], true);
 
                 //CHANGED: Only break if we the method is allowed, otherwise try it on the other methods
                 if ($allowed) {
@@ -132,8 +135,9 @@ final class InheritanceSecurityPolicy implements SecurityPolicyInterface
             }
         }
 
-        if (!$allowed) {
+        if (! $allowed) {
             $class = \get_class($obj);
+
             throw new SecurityNotAllowedPropertyError(sprintf('Calling "%s" property on a "%s" object is not allowed.', $property, $class), $class, $property);
         }
     }
diff --git a/src/Validator/Constraints/Misc/ValidRange.php b/src/Validator/Constraints/Misc/ValidRange.php
index 9f7e33d5..d3760731 100644
--- a/src/Validator/Constraints/Misc/ValidRange.php
+++ b/src/Validator/Constraints/Misc/ValidRange.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,14 +23,12 @@
 
 namespace App\Validator\Constraints\Misc;
 
-
 use Symfony\Component\Validator\Constraint;
 
 /**
  * @Annotation
- * @package App\Validator\Constraints\Misc
  */
 class ValidRange extends Constraint
 {
     public $message = 'validator.invalid_range';
-}
\ No newline at end of file
+}
diff --git a/src/Validator/Constraints/Misc/ValidRangeValidator.php b/src/Validator/Constraints/Misc/ValidRangeValidator.php
index 17d36855..a805508f 100644
--- a/src/Validator/Constraints/Misc/ValidRangeValidator.php
+++ b/src/Validator/Constraints/Misc/ValidRangeValidator.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Validator\Constraints\Misc;
 
-
 use App\Services\Misc\RangeParser;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
@@ -29,7 +31,6 @@ use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
 class ValidRangeValidator extends ConstraintValidator
 {
-
     protected $rangeParser;
 
     public function __construct(RangeParser $rangeParser)
@@ -37,9 +38,9 @@ class ValidRangeValidator extends ConstraintValidator
         $this->rangeParser = $rangeParser;
     }
 
-    public function validate($value, Constraint $constraint)
+    public function validate($value, Constraint $constraint): void
     {
-        if (!$constraint instanceof ValidRange) {
+        if (! $constraint instanceof ValidRange) {
             throw new UnexpectedTypeException($constraint, ValidRange::class);
         }
 
@@ -49,13 +50,13 @@ class ValidRangeValidator extends ConstraintValidator
             return;
         }
 
-        if (!is_string($value)) {
+        if (! is_string($value)) {
             throw new UnexpectedValueException($value, 'string');
         }
 
-        if(!$this->rangeParser->isValidRange($value)) {
+        if (! $this->rangeParser->isValidRange($value)) {
             $this->context->buildViolation($constraint->message)
                 ->addViolation();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Controller/AdminPages/LabelProfileControllerTest.php b/tests/Controller/AdminPages/LabelProfileControllerTest.php
index 37328046..0441055d 100644
--- a/tests/Controller/AdminPages/LabelProfileControllerTest.php
+++ b/tests/Controller/AdminPages/LabelProfileControllerTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Tests\Controller\AdminPages;
 
-
 use App\Entity\LabelSystem\LabelProfile;
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 
@@ -55,4 +57,4 @@ class LabelProfileControllerTest extends AbstractAdminControllerTest
         $this->assertSame($delete, $client->getResponse()->isRedirect(static::$base_path.'/new'));
         $this->assertSame($delete, ! $client->getResponse()->isForbidden(), 'Permission Checking not working!');
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Services/LabelSystem/BarcodeGeneratorTest.php b/tests/Services/LabelSystem/BarcodeGeneratorTest.php
index 191d969d..06130587 100644
--- a/tests/Services/LabelSystem/BarcodeGeneratorTest.php
+++ b/tests/Services/LabelSystem/BarcodeGeneratorTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -23,16 +26,16 @@ namespace App\Tests\Services\LabelSystem;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\Parts\Part;
 use App\Services\LabelSystem\BarcodeGenerator;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 final class BarcodeGeneratorTest extends WebTestCase
 {
-
-    /** @var BarcodeGenerator */
+    /**
+     * @var BarcodeGenerator
+     */
     protected $services;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->services = self::$container->get(BarcodeGenerator::class);
@@ -50,7 +53,7 @@ final class BarcodeGeneratorTest extends WebTestCase
             $content = $this->services->generateSVG($options, $part);
 
             //When type is none, service must return null.
-            if ($type === 'none') {
+            if ('none' === $type) {
                 $this->assertNull($content);
             } else {
                 $this->assertIsString($content);
@@ -70,10 +73,10 @@ final class BarcodeGeneratorTest extends WebTestCase
             $svg = $this->services->generateSVG($options, $part);
 
             //When type is none, service must return null.
-            if ($type === "none") {
+            if ('none' === $type) {
                 $this->assertNull($svg);
             } else {
-                $this->assertStringContainsStringIgnoringCase("SVG", $svg);
+                $this->assertStringContainsStringIgnoringCase('SVG', $svg);
             }
         }
     }
diff --git a/tests/Services/LabelSystem/Barcodes/BarcodeContentGeneratorTest.php b/tests/Services/LabelSystem/Barcodes/BarcodeContentGeneratorTest.php
index b90dc809..42f0e594 100644
--- a/tests/Services/LabelSystem/Barcodes/BarcodeContentGeneratorTest.php
+++ b/tests/Services/LabelSystem/Barcodes/BarcodeContentGeneratorTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -24,21 +27,21 @@ use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
 use App\Services\LabelSystem\Barcodes\BarcodeContentGenerator;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 
 class BarcodeContentGeneratorTest extends KernelTestCase
 {
-    /** @var BarcodeContentGenerator */
+    /**
+     * @var BarcodeContentGenerator
+     */
     private $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(BarcodeContentGenerator::class);
     }
 
-
     public function Barcode1DDataProvider(): array
     {
         return [
@@ -53,7 +56,7 @@ class BarcodeContentGeneratorTest extends KernelTestCase
         return [
             ['/scan/part/0', Part::class],
             ['/scan/lot/0', PartLot::class],
-            ['/scan/location/0', Storelocation::class]
+            ['/scan/location/0', Storelocation::class],
         ];
     }
 
diff --git a/tests/Services/LabelSystem/Barcodes/BarcodeNormalizerTest.php b/tests/Services/LabelSystem/Barcodes/BarcodeNormalizerTest.php
index b1d78760..50ee6e1b 100644
--- a/tests/Services/LabelSystem/Barcodes/BarcodeNormalizerTest.php
+++ b/tests/Services/LabelSystem/Barcodes/BarcodeNormalizerTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -21,16 +24,16 @@
 namespace App\Tests\Services\LabelSystem\Barcodes;
 
 use App\Services\LabelSystem\Barcodes\BarcodeNormalizer;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class BarcodeNormalizerTest extends WebTestCase
 {
-
-    /** @var BarcodeNormalizer */
+    /**
+     * @var BarcodeNormalizer
+     */
     protected $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(BarcodeNormalizer::class);
@@ -80,7 +83,7 @@ class BarcodeNormalizerTest extends WebTestCase
     /**
      * @dataProvider dataProvider
      */
-    public function testNormalizeBarcodeContent(array $expected, string $input)
+    public function testNormalizeBarcodeContent(array $expected, string $input): void
     {
         $this->assertSame($expected, $this->service->normalizeBarcodeContent($input));
     }
@@ -88,7 +91,7 @@ class BarcodeNormalizerTest extends WebTestCase
     /**
      * @dataProvider invalidDataProvider
      */
-    public function testInvalidFormats(string $input)
+    public function testInvalidFormats(string $input): void
     {
         $this->expectException(\InvalidArgumentException::class);
         $this->service->normalizeBarcodeContent($input);
diff --git a/tests/Services/LabelSystem/Barcodes/BarcodeRedirectorTest.php b/tests/Services/LabelSystem/Barcodes/BarcodeRedirectorTest.php
index 2e0e35dd..2ed38fb5 100644
--- a/tests/Services/LabelSystem/Barcodes/BarcodeRedirectorTest.php
+++ b/tests/Services/LabelSystem/Barcodes/BarcodeRedirectorTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -22,15 +25,16 @@ namespace App\Tests\Services\LabelSystem\Barcodes;
 
 use App\Services\LabelSystem\Barcodes\BarcodeRedirector;
 use Doctrine\ORM\EntityNotFoundException;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 
 class BarcodeRedirectorTest extends KernelTestCase
 {
-    /** @var BarcodeRedirector */
+    /**
+     * @var BarcodeRedirector
+     */
     private $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(BarcodeRedirector::class);
@@ -42,7 +46,7 @@ class BarcodeRedirectorTest extends KernelTestCase
             ['part', '/en/part/1'],
             //Part lot redirects to Part info page (Part lot 1 is associated with part 3
             ['lot', '/en/part/3'],
-            ['location', '/en/store_location/1/parts']
+            ['location', '/en/store_location/1/parts'],
         ];
     }
 
diff --git a/tests/Services/LabelSystem/LabelGeneratorTest.php b/tests/Services/LabelSystem/LabelGeneratorTest.php
index b9266b56..bb1d9ba6 100644
--- a/tests/Services/LabelSystem/LabelGeneratorTest.php
+++ b/tests/Services/LabelSystem/LabelGeneratorTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -26,15 +29,16 @@ use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
 use App\Services\LabelSystem\LabelGenerator;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class LabelGeneratorTest extends WebTestCase
 {
-    /** @var LabelGenerator */
+    /**
+     * @var LabelGenerator
+     */
     protected $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(LabelGenerator::class);
@@ -45,14 +49,14 @@ class LabelGeneratorTest extends WebTestCase
         return [
             ['part', Part::class],
             ['part_lot', PartLot::class],
-            ['storelocation', Storelocation::class]
+            ['storelocation', Storelocation::class],
         ];
     }
 
     /**
      * @dataProvider supportsDataProvider
      */
-    public function testSupports(string $type, string $class)
+    public function testSupports(string $type, string $class): void
     {
         $options = new LabelOptions();
         $options->setSupportedElement($type);
@@ -61,18 +65,17 @@ class LabelGeneratorTest extends WebTestCase
         $this->assertTrue($this->service->supports($options, new $class()));
 
         //Ensure that another class is not supported
-        $not_supported = new class extends AbstractDBElement {
-
+        $not_supported = new class() extends AbstractDBElement {
             public function getIDString(): string
             {
-                return "not_important";
+                return 'not_important';
             }
         };
 
         $this->assertFalse($this->service->supports($options, $not_supported));
     }
 
-    public function testMmToPointsArray()
+    public function testMmToPointsArray(): void
     {
         $this->assertSame(
             [0.0, 0.0, 141.7325, 85.0395],
@@ -80,7 +83,7 @@ class LabelGeneratorTest extends WebTestCase
         );
     }
 
-    public function testGenerateLabel()
+    public function testGenerateLabel(): void
     {
         $part = new Part();
         $options = new LabelOptions();
diff --git a/tests/Services/LabelSystem/LabelTextReplacerTest.php b/tests/Services/LabelSystem/LabelTextReplacerTest.php
index 1d677f6c..8bf002e7 100644
--- a/tests/Services/LabelSystem/LabelTextReplacerTest.php
+++ b/tests/Services/LabelSystem/LabelTextReplacerTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -22,20 +25,19 @@ namespace App\Tests\Services\LabelSystem;
 
 use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
-use App\Services\AmountFormatter;
 use App\Services\LabelSystem\LabelTextReplacer;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class LabelTextReplacerTest extends WebTestCase
 {
-
     /**
      * @var LabelTextReplacer
      */
     protected $service;
 
-    /** @var Part */
+    /**
+     * @var Part
+     */
     protected $target;
 
     protected function setUp(): void
@@ -76,7 +78,7 @@ class LabelTextReplacerTest extends WebTestCase
             ['[[UNKNOWN]] Test', '[[UNKNOWN]] Test'],
             ["[[NAME\n]] [[NAME ]]", "[[NAME\n]] [[NAME ]]"],
             ['[[]]', '[[]]'],
-            ['TEST[[ ]]TEST', 'TEST[[ ]]TEST']
+            ['TEST[[ ]]TEST', 'TEST[[ ]]TEST'],
         ];
     }
 
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/AbstractElementProviderTest.php b/tests/Services/LabelSystem/PlaceholderProviders/AbstractElementProviderTest.php
index 1eb79366..0c8437a9 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/AbstractElementProviderTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/AbstractElementProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -21,29 +24,25 @@
 namespace App\Tests\Services\LabelSystem\PlaceholderProviders;
 
 use App\Entity\Base\AbstractDBElement;
-use App\Entity\Parts\Part;
 use App\Services\LabelSystem\PlaceholderProviders\AbstractDBElementProvider;
-use App\Services\LabelSystem\PlaceholderProviders\GlobalProviders;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class AbstractElementProviderTest extends WebTestCase
 {
-    /** @var AbstractDBElementProvider */
+    /**
+     * @var AbstractDBElementProvider
+     */
     protected $service;
 
     protected $target;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(AbstractDBElementProvider::class);
-        $this->target = new class extends AbstractDBElement {
+        $this->target = new class() extends AbstractDBElement {
             protected $id = 123;
 
-            /**
-             * @inheritDoc
-             */
             public function getIDString(): string
             {
                 return 'ignore';
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/GlobalProvidersTest.php b/tests/Services/LabelSystem/PlaceholderProviders/GlobalProvidersTest.php
index 07bd2a87..f338266a 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/GlobalProvidersTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/GlobalProvidersTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -22,17 +25,18 @@ namespace App\Tests\Services\LabelSystem\PlaceholderProviders;
 
 use App\Entity\Parts\Part;
 use App\Services\LabelSystem\PlaceholderProviders\GlobalProviders;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class GlobalProvidersTest extends WebTestCase
 {
-    /** @var GlobalProviders */
+    /**
+     * @var GlobalProviders
+     */
     protected $service;
 
     protected $target;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(GlobalProviders::class);
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/NamedElementProviderTest.php b/tests/Services/LabelSystem/PlaceholderProviders/NamedElementProviderTest.php
index 06308738..cc98be83 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/NamedElementProviderTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/NamedElementProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -21,28 +24,23 @@
 namespace App\Tests\Services\LabelSystem\PlaceholderProviders;
 
 use App\Entity\Contracts\NamedElementInterface;
-use App\Entity\Parts\Part;
-use App\Services\LabelSystem\PlaceholderProviders\GlobalProviders;
 use App\Services\LabelSystem\PlaceholderProviders\NamedElementProvider;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class NamedElementProviderTest extends WebTestCase
 {
-    /** @var NamedElementProvider */
+    /**
+     * @var NamedElementProvider
+     */
     protected $service;
 
     protected $target;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(NamedElementProvider::class);
-        $this->target = new class implements NamedElementInterface {
-
-            /**
-             * @inheritDoc
-             */
+        $this->target = new class() implements NamedElementInterface {
             public function getName(): string
             {
                 return 'This is my Name';
@@ -53,7 +51,7 @@ class NamedElementProviderTest extends WebTestCase
     public function dataProvider(): array
     {
         return [
-            ['This is my Name', '[[NAME]]']
+            ['This is my Name', '[[NAME]]'],
         ];
     }
 
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/PartLotProviderTest.php b/tests/Services/LabelSystem/PlaceholderProviders/PartLotProviderTest.php
index c430fad2..95dca4cb 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/PartLotProviderTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/PartLotProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,22 +23,22 @@
 
 namespace App\Tests\Services\LabelSystem\PlaceholderProviders;
 
-use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
-use App\Services\LabelSystem\PlaceholderProviders\NamedElementProvider;
 use App\Services\LabelSystem\PlaceholderProviders\PartLotProvider;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class PartLotProviderTest extends WebTestCase
 {
-    /** @var PartLotProvider */
+    /**
+     * @var PartLotProvider
+     */
     protected $service;
 
     protected $target;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         \Locale::setDefault('en');
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/PartProviderTest.php b/tests/Services/LabelSystem/PlaceholderProviders/PartProviderTest.php
index 6e7928bd..3680199d 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/PartProviderTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/PartProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,14 +23,10 @@
 
 namespace App\Tests\Services\LabelSystem\PlaceholderProviders;
 
-use App\Entity\Contracts\TimeStampableInterface;
 use App\Entity\Parts\Category;
 use App\Entity\Parts\Footprint;
-use App\Entity\Parts\Manufacturer;
 use App\Entity\Parts\Part;
-use App\Services\LabelSystem\PlaceholderProviders\GlobalProviders;
 use App\Services\LabelSystem\PlaceholderProviders\PartProvider;
-use DateTime;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
@@ -36,15 +35,19 @@ use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
  */
 class PartProviderTest extends WebTestCase
 {
-    /** @var PartProvider */
+    /**
+     * @var PartProvider
+     */
     protected $service;
 
     protected $target;
 
-    /** @var \Doctrine\ORM\EntityManager */
+    /**
+     * @var \Doctrine\ORM\EntityManager
+     */
     protected $em;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(PartProvider::class);
diff --git a/tests/Services/LabelSystem/PlaceholderProviders/TimestampableElementProviderTest.php b/tests/Services/LabelSystem/PlaceholderProviders/TimestampableElementProviderTest.php
index 2bf3bcaa..a4b9611b 100644
--- a/tests/Services/LabelSystem/PlaceholderProviders/TimestampableElementProviderTest.php
+++ b/tests/Services/LabelSystem/PlaceholderProviders/TimestampableElementProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -28,29 +31,24 @@ use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
 class TimestampableElementProviderTest extends WebTestCase
 {
-    /** @var GlobalProviders */
+    /**
+     * @var GlobalProviders
+     */
     protected $service;
 
     protected $target;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         \Locale::setDefault('en');
         $this->service = self::$container->get(TimestampableElementProvider::class);
-        $this->target = new class implements TimeStampableInterface {
-
-            /**
-             * @inheritDoc
-             */
+        $this->target = new class() implements TimeStampableInterface {
             public function getLastModified(): ?DateTime
             {
                 return new \DateTime('2000-01-01');
             }
 
-            /**
-             * @inheritDoc
-             */
             public function getAddedDate(): ?DateTime
             {
                 return new \DateTime('2000-01-01');
diff --git a/tests/Services/LabelSystem/SandboxedTwigProviderTest.php b/tests/Services/LabelSystem/SandboxedTwigProviderTest.php
index 43e1a8b3..b9cc6849 100644
--- a/tests/Services/LabelSystem/SandboxedTwigProviderTest.php
+++ b/tests/Services/LabelSystem/SandboxedTwigProviderTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -24,18 +27,18 @@ use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\Parts\Part;
 use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
-use App\Services\LabelSystem\Barcodes\BarcodeExampleElementsGenerator;
 use App\Services\LabelSystem\SandboxedTwigProvider;
-use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 use Twig\Sandbox\SecurityError;
 
 class SandboxedTwigProviderTest extends WebTestCase
 {
-    /** @var SandboxedTwigProvider */
+    /**
+     * @var SandboxedTwigProvider
+     */
     private $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(SandboxedTwigProvider::class);
@@ -65,26 +68,25 @@ class SandboxedTwigProviderTest extends WebTestCase
             '],
             ['
                 {{ part.reviewNeeded }} {{ part.tags }} {{ part.mass }}
-            ']
+            '],
         ];
     }
 
     public function twigNotAllowedDataProvider(): array
     {
         return [
-            ["{% block test %} {% endblock %}"],
-            ["{% deprecated test %}"],
-            ["{% flush %}"],
+            ['{% block test %} {% endblock %}'],
+            ['{% deprecated test %}'],
+            ['{% flush %}'],
             ["{{ part.setName('test') }}"],
-            ["{{ part.setCategory(null) }}"]
+            ['{{ part.setCategory(null) }}'],
         ];
     }
 
-
     /**
      * @dataProvider twigDataProvider
      */
-    public function testTwigFeatures(string $twig)
+    public function testTwigFeatures(string $twig): void
     {
         $options = new LabelOptions();
         $options->setSupportedElement('part');
@@ -104,7 +106,7 @@ class SandboxedTwigProviderTest extends WebTestCase
     /**
      * @dataProvider twigNotAllowedDataProvider
      */
-    public function testTwigForbidden(string $twig)
+    public function testTwigForbidden(string $twig): void
     {
         $this->expectException(SecurityError::class);
 
diff --git a/tests/Services/Misc/RangeParserTest.php b/tests/Services/Misc/RangeParserTest.php
index f4c28077..b6023534 100644
--- a/tests/Services/Misc/RangeParserTest.php
+++ b/tests/Services/Misc/RangeParserTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -30,7 +33,7 @@ class RangeParserTest extends WebTestCase
      */
     protected $service;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         self::bootKernel();
         $this->service = self::$container->get(RangeParser::class);
@@ -42,19 +45,19 @@ class RangeParserTest extends WebTestCase
             [[], ''],
             [[], '   '],
             [[], "\t"],
-            [[1], "1"],
-            [[1, 2, 3], "1,2, 3"],
-            [[1, 2, 3], "1-3"],
-            [[1, 2, 3, 4], "1- 3, 4"],
-            [[1, 2, 3, 4], "1, 2,3 -   4"],
-            [[1, 2, 3], "  1; 2, 3"],
-            [[-1, 0, 1, 2], "-1; 0; 1, 2"],
-            [[4,3, 1, 2], "4,3, 1;2"],
-            [[1, 2, 3, 4], "2-1, 3-4"],
-            [[1], "1-1"],
-            [[-3, -2, -1], "-3--1"],
-            [[1, 2, 3], "1,,2;;,,3"],
-            [[100, 1000, 1], "100, 1000, 1"],
+            [[1], '1'],
+            [[1, 2, 3], '1,2, 3'],
+            [[1, 2, 3], '1-3'],
+            [[1, 2, 3, 4], '1- 3, 4'],
+            [[1, 2, 3, 4], '1, 2,3 -   4'],
+            [[1, 2, 3], '  1; 2, 3'],
+            [[-1, 0, 1, 2], '-1; 0; 1, 2'],
+            [[4, 3, 1, 2], '4,3, 1;2'],
+            [[1, 2, 3, 4], '2-1, 3-4'],
+            [[1], '1-1'],
+            [[-3, -2, -1], '-3--1'],
+            [[1, 2, 3], '1,,2;;,,3'],
+            [[100, 1000, 1], '100, 1000, 1'],
             [[], 'test', true],
             [[], '1-2-3-4,5', true],
             [[], '1 2 3, 455, 23', true],
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 469dccee..cc712a19 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 use Symfony\Component\Dotenv\Dotenv;
 
 require dirname(__DIR__).'/vendor/autoload.php';