Update

cgi-bin/uebung09/questions-show.php

@@ -18,8 +18,9 @@ END;
 $db = new Database();
 
 $questions = $db->getQuestions();
+$questionsobj = (object) $questions;
 
-foreach($questions as $question) {
+foreach($questionsobj as $question) {
         echo("<tr>");
         echo("<td>$question->question</td>");
         echo("<td>$question->answer0</td>");