kimse kusura bakmasın yazan ücretsiz dağıtıyor bende netten buldum
<?php
/*
+ ----------------------------------------------------------------------------+
|     Download Script
|      License: GPL General Public License
|      Website: http://mvideos.co.cc
|      Author: Jeff Suthers
+----------------------------------------------------------------------------+
*/
function getContent($url) {
    $ch = curl_init();
    curl_setopt ($ch, CURLOPT_URL, $url);
    curl_setopt ($ch, CURLOPT_HEADER, 0);

    ob_start();
    curl_exec ($ch);
    curl_close ($ch);
    $string = ob_get_contents();
    ob_end_clean();
    return $string;    
}
function fetch_headers($url) {
   $headers = array();
   $url = trim($url);

   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_HEADER, 1);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_NOBODY ,1);
   $data = curl_exec($ch);
   $errormsg = curl_error($ch);
   curl_close($ch);
               
   $headers = explode("\n", $data);
   return $headers;
}
function getYoutubeToken($id) {
   $path = "http://www.youtube.com/get_video_info?";
   $cont = getContent($path."&video_id=".$id);
   parse_str($cont, $opts);
   return $opts['token'];
}


$videoItem = trim($_GET['item']);
$videoType = "";
$videoPath = "http://www.youtube.com/get_video";

if ($_GET['type'] != "0") {
   $videoType = "&fmt=".$_GET['type'];
}
if ($videoItem != "") {
   $videoTokn = getYoutubeToken($videoItem);
   $videoURL = $videoPath."?video_id=".$videoItem."&t=".$videoTokn.$videoType;
   $headers = fetch_headers($videoURL);
   for ($i=0; $i<count($headers); $i++) {
      if (strstr($headers[$i], "ocation:")) {
         $str1 = explode("ocation:", $headers[$i]);
         $link = trim($str1[1]);
         break;
      }
   }
   header("Location: ".$link);
   exit;
}
?>