[UPDATE] YouTube V3api Supports 99% Videos (including VEVO and AGE restricted videos)

yt.php

<?php
/* *******************************
yTube.MOBI v3api 

This script check if you have curl or file_get_contents 
enabled on your server and uses the function that is enabled

you can call the script like this: require_once('yt.php');
or you can simply copy/paste this code in your file

if you need help contact me: http://ytube.mobi/contact/

******************************* */
$id = isset($_GET['id']) ? $_GET['id'] : '';
$site = 'your site name';
$host = $_SERVER['HTTP_HOST'];
if (function_exists('curl_version'))
{
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, 'http://ytube.mobi/yt.php?videoid='.$id.'&site='.$site.'');
  curl_setopt($ch, CURLOPT_REFERER, $host);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_TIMEOUT, 5);
  $ytube = curl_exec($ch);
  curl_close($ch);
}
else if (file_get_contents(__FILE__) && ini_get('allow_url_fopen'))
{
  $opts = array(
  'http'=>array(
   'method'=>"GET",
   'header'=>"Origin: $host"
  )
 );
$ytube = file_get_contents('http://ytube.mobi/yt.php?videoid='.$id.'&site='.$site.'', false, stream_context_create($opts));
}
  else
{
  echo 'You have neither cUrl installed nor allow_url_fopen activated. Please setup one of those!';
}
echo $ytube; //use $ytube; where you want to display the download links
?>