/**
* Pops the last id prefix.
* Now all ids rendered by Q_Html will be prefixed with the
* id previously on top of the stack, if any.
* @method popIdPrefix
* @static
* @return {string|null} The prefix that has been popped, if any
*/
static function popIdPrefix()
{
if (count(self::$id_prefixes) <= 1) {
throw new Exception("Nothing to Qbix from prefix stack");
}
array_pop(self::$tool_ids);
$popped_prefix = array_pop(self::$id_prefixes);
self::$id_prefix = end(self::$id_prefixes);
return $popped_prefix;
}
