Added an PHP CS fixer config file and applied it to files.

We now use the same the same style as the symfony project, and it allows us to simply fix the style by executing php_cs_fixer fix in the project root.

src/Repository/StructuralDBElementRepository.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony)
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
  * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
  *
@@ -17,52 +17,50 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
- *
  */
 
 namespace App\Repository;
 
-
 use App\Entity\Base\StructuralDBElement;
 use Doctrine\ORM\EntityRepository;
 
 class StructuralDBElementRepository extends EntityRepository
 {
-
     /**
      * Finds all nodes without a parent node. They are our root nodes.
      *
      * @return StructuralDBElement[]
      */
-    public function findRootNodes() : array
+    public function findRootNodes(): array
     {
         return $this->findBy(['parent' => null], ['name' => 'ASC']);
     }
 
     /**
      * Gets a flattened hierachical tree. Useful for generating option lists.
+     *
      * @param StructuralDBElement|null $parent This entity will be used as root element. Set to null, to use global root
+     *
      * @return StructuralDBElement[] A flattened list containing the tree elements.
      */
     public function toNodesList(?StructuralDBElement $parent = null): array
     {
-        $result = array();
+        $result = [];
 
         $entities = $this->findBy(['parent' => $parent], ['name' => 'ASC']);
 
-        /**
+        /*
          * I think it is very difficult to replace this recursive array_merge,
          * so if you want to change it you should have a better idea than adding each list to $result array
          * and do an array_merge(...$result) at the end.
          */
 
         foreach ($entities as $entity) {
-            /** @var StructuralDBElement $entity */
+            /* @var StructuralDBElement $entity */
             $result[] = $entity;
             $result = array_merge($result, $this->toNodesList($entity));
         }
 
         return $result;
     }
-
-}
+}