imbo/imbo — pull request #130 by christeredvartsen (2012-12-17 18:41:44+00:00)
Title: Use call_user_func so Imbo works on php-5.3 again

Use `call_user_func($callback, $event);` instead of `$callback($event);` since the latter won't work on PHP <= 5.4 if `$callback` is `array($obj, 'method')`.