Download YouTube's video

install:

pear channel-discover openpear.org
sudo pear install openpear/Wozozo_WWW_YouTube

usage:

<?php
require_once 'Wozozo/WWW/YouTube.php';
Wozozo_WWW_YouTube::download('gQf_QTsvXCU'); //YouTube's videoID
Wozozo_WWW_YouTube::download('http://www.youtube.com/watch?v=gQf_QTsvXCU'); //

zf tool's provider

zf enable config.provider Wozozo_WWW_YouTube_Tool_YoutubeProvider