3v4l.org

run code in 300+ PHP versions simultaneously
<?php function _getYoutubeVideoId($url) { $parts = parse_url($url); //For seriously malformed urls if ($parts === false) { return false; } switch ($parts['host']) { case 'youtu.be': return substr($parts['path'], 1); break; case 'youtube.com': case 'www.youtube.com': parse_str($parts['query'], $params); return $params['v']; break; default: return false; break; } } var_dump(_getYoutubeVideoId("http://www.youtube.com/watch?v=WQq0RAbj4i8"));

preferences:
31.76 ms | 402 KiB | 5 Q