This PHP class takes a YouTube URL (or YouTube Video-ID) and downloads the video to your computer. Optionally, you can convert any YouTube video to an MP3 Audio file (requires ffmpeg to be installed!).

For an example integration, try the demo:
http://eyecatchup.github.com/php-yt_downloader/index.html?vid=http://www.youtube.com/watch?v=cMMpLEGlFWE

The latest stable version can be downloaded from the downloads tab, or using the following link:
https://github.com/downloads/eyecatchup/php-yt_downloader/eyecatchup-php-yt_downloader-403c053.zip

The UI demo code is available here: https://github.com/eyecatchup/php-yt_downloader/tree/gh-pages

Usage is pretty straight forward:

<?php
    require('youtube-dl.class.php');
    try {
        // Instantly download a YouTube video (using the default settings).
        new yt_downloader('http://www.youtube.com/watch?v=aahOEZKTCzU', TRUE);

        // Instantly download a YouTube video as MP3 (using the default settings).
        new yt_downloader('http://www.youtube.com/watch?v=aahOEZKTCzU', TRUE, 'audio');
    }
    catch (Exception $e) {
        die($e->getMessage());
    }

You can provide either a YouTube URL (as used in the example), or a Youtube Video-ID. The class will check whether the given input value is a YouTube URL, or a YouTube Video-ID . If it's a URL, the ID will be extracted automatically. So,

new yt_downloader("http://www.youtube.com/watch?v=aahOEZKTCzU"); is identical to new yt_downloader("https://www.youtube.com/watch?feature=related&v=aahOEZKTCzU"); is identical to new yt_downloader("aahOEZKTCzU");.

For more (advanced) examples see the example-*.php files.

Use the youtube-dl.config.php file to set your download preferences.

URL: https://github.com/eyecatchup/php-yt_downloader/
License: http://eyecatchup.mit-license.org/
(c) 2012, Stephan Schmitz eyecatchup@gmail.com