Double quotes changed to single quotes

Created by: BaranekD

templates/perunauthorize_403.php

 <script>
     // When the user clicks on <div>, open the popup
     function myFunction() {
-        var popup = document.getElementById("myPopup");
-        popup.classList.toggle("show");
+        var popup = document.getElementById('myPopup');
+        popup.classList.toggle('show');
     }
 </script>
 
@@ -18,7 +18,7 @@
  * @package SimpleSAMLphp
  */
 
-$this->data['header'] = "";
+$this->data['header'] = '';
 $this->data['403_header'] = $this->t('{perunauthorize:Perunauthorize:403_header}');
 $this->data['403_text'] = $this->t('{perunauthorize:Perunauthorize:403_text}');
 $this->data['403_subject'] = $this->t('{perunauthorize:Perunauthorize:403_subject}');
@@ -54,7 +54,7 @@ function getBaseURL($t, $type = 'get', $key = null, $value = null)
     } else {
         $text = '';
         foreach ($vars as $k => $v) {
-            $text .= '<input type="hidden" name="' . $k . '" value="' . htmlspecialchars($v) . '" />' . "\n";
+            $text .= '<input type="hidden" name="' . $k . '" value="' . htmlspecialchars($v) . '" />' . PHP_EOL;
         }
         return $text;
     }
@@ -72,17 +72,17 @@ $this->includeAtTemplateBase('includes/header.php');
 
 <div class="error_message">
     <h1><?php echo $this->data['403_header']; ?></h1>
-    <p><?php echo $this->data['403_text'] . $this->data['serviceName'] . "<br>";
+    <p><?php echo $this->data['403_text'] . $this->data['serviceName'] . '<br>';
     if (isset($this->data['informationURL'])) {
-        echo "( " . $this->data['403_informationPage'] . "<a href=\"" . $this->data['informationURL'] . "\">" .
-            $this->data['informationURL'] . "</a>" . " )";
+        echo '( ' . $this->data['403_informationPage'] . '<a href="' . $this->data['informationURL'] . '">' .
+            $this->data['informationURL'] . '</a> )';
     } ?></p>
 
     <p>
         <?php echo $this->data['403_contactSupport'] .
-            "<a href=\"mailto:" . $this->data['administrationContact'] . "?subject=" .
+                   '<a href="mailto:' . $this->data['administrationContact'] . '?subject=' .
             $this->data['403_subject'] . $this->data['serviceName'] .
-            "\">" . $this->data['administrationContact'] . "</a>" . "."; ?>
+                   '">' . $this->data['administrationContact'] . '</a>.'; ?>
     </p>
 </div>