Probleme download youtube

Comment envoyer le url youtube en get pour post pour avoir le lien de telechargement avec ce script

<?php
if (preg_match('#^(http|https)\:\/\/(www\.)?youtube\.com/#', $url)){
$url = urldecode($url);
$url = str_replace('www.', '', $url);
$url = str_replace('http://', 'http://www.', $url);
$data = $this->curl($url,"","");
if(strstr($data,'verify-age-thumb')) $report = Tools_get::report($url,"Adult");
elseif(strstr($data,'das_captcha')) $report = Tools_get::report($url,"youtube_captcha");
elseif(!preg_match('/stream_map=(.[^&]*?)&/i',$data,$match)) $report = Tools_get::report($url,"ErrorLocating");
elseif(preg_match('/stream_map=(.[^&]*?)&/i',$data,$match)) {
$this->max_size = $this->max_size_other_host;
$fmt_url = urldecode($match[1]);
if(preg_match('/^(.*?)\\\\u0026/',$fmt_url,$match)) $fmt_url = $match[1];
$urls = explode(',',$fmt_url);
$foundArray = array();
$signature = array();

foreach($urls as $urldl){
if(preg_match('/itag=([0-9]*)&url=(.*?)&/si',$urldl,$um)){
$u = urldecode($um[2]);
$foundArray[$um[1]] = trim($u);
preg_match('/sig=(.*?)&/si',$urldl,$sig);
$signature[$um[1]] = $sig[1];
}
}

if(preg_match('<meta name="title" content="(.*?)">', $data, $matches)) $title = $matches[1];
else $title = "unknown";

$sig = "";
if (isset($foundArray[36])) {
$URL=$foundArray[36];
$sig=$signature[36];
$URL .= "&signature=".$sig;
$this->youtube = $title . ".3gp";
echo '<div id="link">'.$this->get($URL).'</div>';
}
if (isset($foundArray[35])) {
$URL=$foundArray[35];
$sig=$signature[35];
$URL .= "&signature=".$sig;
$this->youtube = $title . ".flv";
echo '<div id="link">'.$this->get($URL).'</div>';
}
if (isset($foundArray[18])) {
$URL=$foundArray[18];
$sig=$signature[18];
$URL .= "&signature=".$sig;
$this->youtube= $title . ".mp4";
echo '<div id="link">'.$this->get($URL).'</div>';
}
if (isset($foundArray[22])) {
$URL=$foundArray[22];
$sig=$signature[22];
$URL .= "&signature=".$sig;
$this->youtube = $title . ".mp4";
echo '<div id="link">'.$this->get($URL).'</div>';
}
if (isset($foundArray[37])) {
$URL=$foundArray[37];
$sig=$signature[37];
$URL .= "&signature=".$sig;
$this->youtube = $title . ".mp4";
echo '<div id="link">'.$this->get($URL).'</div>';
}
}
exit;
}
elseif(isset($this->youtube)) {
$URL = $url;
$size_name = Tools_get::size_name(trim($URL), "");
if($size_name[0] > 200 ){
$filename = $this->youtube;
$filename = str_replace("/","",$filename);
$filesize = $size_name[0];
$link = $URL;
}
else exit;
}

Merci a c'eux qui m'aide