Get YouTube video ID from URL

gistfile1.php

<?php
/*
Works for the following inputs and more:
dQw4w9WgXcQ
http://www.youtube.com/?v=dQw4w9WgXcQ
http://www.youtube.com/embed/dQw4w9WgXcQ
http://www.youtube.com/username#p/c/5555550123/0/dQw4w9WgXcQ
http://www.youtube.com/v/dQw4w9WgXcQ
http://www.youtube.com/v/dQw4w9WgXcQ?feature=autoshare&version=3&autohide=1&autoplay=1
http://www.youtube.com/watch?v=dQw4w9WgXcQ&hd=1&t=26s
http://www.youtube.com/watch?v=dQw4w9WgXcQ
http://youtu.be/dQw4w9WgXcQ
http://youtu.be/dQw4w9WgXcQ?hd=1&t=7s
<iframe width="560" height="315" src="http://www.youtube.com/embed/dQw4w9WgXcQ" frameborder="0" allowfullscreen></iframe>
*/


/**
 * Get 11-character YouTube video ID from a URL
 *
 * @param string $url URL to video
 * @return string 11 character string on success, empty string on failure
 */
function getYouTubeId($url) {
	// Make sure you've entered a valid URL
	if (!is_string($url) || (strlen($url) < 11)) {
		return '';
	}

	// Get the 11-character ID from the URL
	if (strlen($url) == 11) {
		// Code was entered directly
		$code = $url;
	} else if (preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $url, $match)) {
		$code = $match[1];
	} else {
		$code = '';
	}

	// Make sure code is correct
	$code = preg_replace('/[^0-9a-zA-Z-_]/', '', $code);
	if (strlen($code) != 11) {
		$code = '';
	}

	return $code;
}