PHP: Gets the video code from a YouTube video URL.

get-youtube-code.php

<?php

/**
 * Returns the ID of a YouTube Video URL
 *
 * This works with both the short and full URL.
 *
 * @param  string $url The video URL
 * @return string  The video ID
 * @author TJ Miller http://tjay.co
 */
function getYoutubeCode($url)
{
    $parts = [];
    $video_code = false;

    if (preg_match('/youtu.be/', $url)) {
        $video_code = preg_match_all('/youtu\.be\/(.*)\??/', $url, $matches);
        $video_code = $matches[1][0];
    } else {
        preg_match('/(\?v\=)+(.{11})/', $url, $parts);
        $video_code = substr($parts[0], -11);
    }

    return $video_code;
}