Update

cgi-bin/uebung09/questions-show.php

@@ -18,7 +18,7 @@ END;
 $db = new Database();
 
 $questions = $db->getQuestions();
-$questionsobj = (object) $questions;
+$questionsobj = json_decode(json_encode($questions), false);
 
 foreach($questionsobj as $question) {
         echo("<tr>");