Youtube video uploaded successfully on local, but on server (online) only 0 byte flv is uploaded

I am using php tube class to download youtube videos. The video is automatically uploaded to the folder by submitting the YouTube URL.

everything works fine on local (XAMPP) but when I upload it to the server (online) ONLY ONLY 0 byte flv file is saved.

I am also debugging code both sides (local and global).

I am getting url like this (on local )

http://www.youtube.com/get_video?video_id=1jNWCFwqPvM&=vjVQa1PpcFMyYCECyfmYENWklpwXGyhVgJpSFPgNAEc%3D

whereas on the server I got a link like this

http://www.youtube.com/ get_video?video_id=1jNWCFwqPvM&t=vjVQa1PpcFNS3SPxIXi8hy-NF4qZFFrScDXCjGLLrLc%3D

when I copy the link from local and paste it into the browser then the download window appears in the browser, while when I copy the link from the server and paste in the browser only a blank page appears.

• please solve my problem, where is the error?
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• on the server side sometimes I get a link like

  http://www.youtube.com/get_video?video_id=1jNWCFwqPvM&t=vjVQa1PpcFNS3SPxIXi8hy-NF4qZFFrScDXCjGLLrLc%3D
  
  

but sometimes i only get

http://www.youtube.com/get_video?video_id=&t=

How to solve them?

UPDATE:

I am debugging all the code and found that it file_get_contents()

returns string (0) on the server, whereas on local it returns some integer value. allow_url_fopen

- onmy server

this is index.php

include_once('functions.php');  
$url =  $_POST['url']; // here is url of youtube video
$pattern = getPatternFromUrl($url); 
$flv_path = GrabFlvFromYoutube($pattern );
echo "File Successfully Downloaded at:".$flv_path."<br/>";

      

        
        
        
      

    

these functions are in functions.php

function getPatternFromUrl($url)
{
$url = $url.'&';
$pattern = '/v=(.+?)&+/';
preg_match($pattern, $url, $matches);
//echo $matches[1]; die;
return ($matches[1]);
}

      

        
        
        
      

    

and

function GrabFlvFromYoutube( $pattern )
{
require_once ("phptube.php");
$tube = new PHPTube ();
$flv_http_path = $tube->download($pattern) ;
    echo "<br/>Complete URL:".$flv_http_path;
set_time_limit(0);

$data = file_get_contents($flv_http_path);  
//var_dump(file_get_contents($flv_http_path));  
$new_flv_path = dirname(_FILE_).'/flvs/'.$pattern.'-'.time().'.flv' ;

echo "<br />File uploaed:";
    file_put_contents($new_flv_path, $data);    

return $new_flv_path ;
}

      

        
        
        
      

    

below function in phptube.php

class PHPTube {

var $cookies;
var $mgr;
var $req; 
var $debug = true;
var $auth = false;

function PHPTube () {}
    function download ($video_id) {

    $url = "http://www.youtube.com/watch?v=".$video_id;     
$this->req =& new HTTP_Request($url);
$response = $this->req->sendRequest();
if (PEAR::isError($response)) {
    $response->getMessage()."\n";
} else {    
        $page = $this->req->getResponseBody();  
    $vpattern = '/v=(.*?)&/';
    //$vpattern ='/video_id:(.*?)/';
    preg_match($vpattern,$page,$mv);
    //preg_match('&"video_id": "(.*?)"&', $page, $mv); 
    echo "<br />Video ID:".$v_id = $mv[1]; 
    //$tpattern='/"t": "(.*?)"/';
    $tpattern = '/&t=(.*?)&/';
    preg_match($tpattern,$page,$tickets);
    echo "<br />Token ID:".$token = $tickets[1];
    $curl = "video_id=";
    $curl .= $v_id;
    $curl .= "&t=";         
    $curl.= $token;
    //echo "<br />Query String:".$curl; die;
    $url = "http://www.youtube.com/get_video?".$curl;  
    if ($this->debug)
     return $url;
     }
   }
 }