Proxy get

proxyget.php

<?php 
$url = $_GET['u'];
if( preg_match('/^http:\/\/[a-zA-Z0-9]{1,5}.twimg.com/',$url) ){
  $img = file_get_contents($url);  
  foreach($http_response_header as $head){
    if(preg_match('/^Content-Type/',$head)){
      header($head);
      break;
    }
  }
  echo $img;
 
}else{
  echo 'invalid url';
}