Habe es mit diesem Code probiert:
$items = getItems('ST02','ST21','ST13');
shuffle($items);
question('ST02','ST21','ST13', $items);
und Folgendes kommt dann:
Questionnaire Error (page 6)
The selection criterion given in getItems() is . The function does not know this criterion.
Warning (page 6)
The argument ST21 has been used in a function of a PHP code block, but is unknown.
Warning (page 6)
The argument ST13 has been used in a function of a PHP code block, but is unknown.