<?php
 
$posturl  = '&GALX=obiRBhLUBIa&Email=myfancyusername@gmail.com&Passwd=myfancypassword&rmShown=1&signIn=Sign+in&asts=';
 
$ch = curl_init();
curl_setopt($ch, CURLOPT_COOKIEJAR, "/tmp/cookieYoutube");
curl_setopt($ch, CURLOPT_URL,"https://www.google.com/accounts/ServiceLogin?service=youtube");
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"); 
curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/x-www-form-urlencoded"));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, "/tmp/cookieYoutube");
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false );
curl_setopt($ch, CURLOPT_REFERER,"https://www.google.com/accounts/ServiceLogin?service=youtube");
curl_setopt($ch, CURLOPT_POSTFIELDS, $posturl);
 
 
$output = curl_exec ($ch); 
 
curl_close($ch);
 
echo $output;
 
?>