fix undefined constants, refs #3239

Merge request studip/studip!2199

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/models/Courseware/StructuralElement.php b/lib/models/Courseware/StructuralElement.php
index 11227d2..8c6d1de 100644
--- a/lib/models/Courseware/StructuralElement.php
+++ b/lib/models/Courseware/StructuralElement.php
@@ -177,10 +177,10 @@ class StructuralElement extends \SimpleORMap implements \PrivacyObject
     {
         if (is_null($image)) {
             $this->image_id = null;
-        } elseif (is_a($image, \FileRef)) {
+        } elseif (is_a($image, \FileRef::class)) {
             $this->image_id = $image->getId();
             $this->image_type = \FileRef::class;
-        } elseif (is_a($image, \StockImage)) {
+        } elseif (is_a($image, \StockImage::class)) {
             $this->image_id = $image->getId();
             $this->image_type = \StockImage::class;
         } else {
@@ -1167,6 +1167,6 @@ SQL;
         if ($structuralElements) {
             $storage->addTabularData(_('Courseware Seiten'), 'cw_structural_elements', $structuralElements);
         }
-        
+
     }
 }