/**
* Check recursively if there are duplicate $attr defined in children of $e
* set global var $has_duplicate_attribute to true if there is, otherwise, set it to false
*/
public static function has_duplicate_attribute($e, $attr, &$id_array)
{
global $has_duplicate_attribute;
if ($has_duplicate_attribute) {
return;
}
foreach ($e->children() as $child) {
$id_val = strtolower(trim($child->attr[$attr]));
if ($id_val != "" && in_array($id_val, $id_array)) {
$has_duplicate_attribute = true;
} else {
if ($id_val != "") {
array_push($id_array, $id_val);
}
BasicChecks::has_duplicate_attribute($child, $attr, $id_array);
}
}
}
