Get Youtube video ID from a string with PHP

yt.php

<?php

abstract class Helper {
	public static function getVidId($text) {
		if(preg_match('~(?:https?://)?(?:www.)?(?:youtube.com|youtu.be|youtube-nocookie.com)/(?:watch\?v=|embed/)?([^"\?\s]+)~', $introtext, $match)) {
			return $match[1]; // 
		}	
	}
}

$vidid = Helper::getVidId('https://www.youtube.com/watch?v=aqUo1Az6g0U');

echo $vidid;