public static function compare_by_title(QTIAssessmentItem $a, QTIAssessmentItem $b)
{
// get titles
$ta = $a->data("title");
$tb = $b->data("title");
// if both lack titles compare by ID
if ($ta === false && $tb === false) {
return strcasecmp($a->getQTIID(), $b->getQTIID());
}
// if A lacks a title B is further up the list and so A is "more"
if ($ta === false) {
return 1;
}
// if B lacks a title A is further up the list and so A is "less"
if ($tb === false) {
return -1;
}
return strcasecmp($ta, $tb);
}
