[PHP] Get youtube ID Form URL .php

Cách 1

function getYouTubeVideoId($url)
{
    $video_id = false;
    $url = parse_url($url);
    if (strcasecmp($url['host'], 'youtu.be') === 0)
    {
        #### (dontcare)://youtu.be/<video id>
        $video_id = substr($url['path'], 1);
    }
    elseif (strcasecmp($url['host'], 'www.youtube.com') === 0)
    {
        if (isset($url['query']))
        {
            parse_str($url['query'], $url['query']);
            if (isset($url['query']['v']))
            {
                #### (dontcare)://www.youtube.com/(dontcare)?v=<video id>
                $video_id = $url['query']['v'];
            }
        }
        if ($video_id == false)
        {
            $url['path'] = explode('/', substr($url['path'], 1));
            if (in_array($url['path'][0], array('e', 'embed', 'v')))
            {
                #### (dontcare)://www.youtube.com/(whitelist)/<video id>
                $video_id = $url['path'][1];
            }
        }
    }else{
        return false;
    }
    return $video_id;
}

Cách 2
/*
 * http://stackoverflow.com/questions/5830387/how-to-find-all-youtube-video-ids-in-a-string-using-a-regex
 */
function linkifyYouTubeURLs($text) {
    $text = preg_replace('~
        # Match non-linked youtube URL in the wild. (Rev:20130823)
        https?://         # Required scheme. Either http or https.
        (?:[0-9A-Z-]+\.)? # Optional subdomain.
        (?:               # Group host alternatives.
          youtu\.be/      # Either youtu.be,
        | youtube         # or youtube.com or
          (?:-nocookie)?  # youtube-nocookie.com
          \.com           # followed by
          \S*             # Allow anything up to VIDEO_ID,
          [^\w\s-]       # but char before ID is non-ID char.
        )                 # End host alternatives.
        ([\w-]{11})      # $1: VIDEO_ID is exactly 11 chars.
        (?=[^\w-]|$)     # Assert next char is non-ID or EOS.
        (?!               # Assert URL is not pre-linked.
          [?=&+%\w.-]*    # Allow URL (query) remainder.
          (?:             # Group pre-linked alternatives.
            [\'"][^<>]*>  # Either inside a start tag,
          | </a>          # or inside <a> element text contents.
          )               # End recognized pre-linked alts.
        )                 # End negative lookahead assertion.
        [?=&+%\w.-]*        # Consume any URL (query) remainder.
        ~ix', 
        '<a href="http://www.youtube.com/watch?v=$1">YouTube link: $1</a>',
        $text);
    return $text;
}