View file free/img.php

<?php

/**
 * @author Demon
 * @copyright 2012
 */

function connect($url){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
    $answer = curl_exec($ch);
    curl_close($ch);
    
    return $answer;
}

header("Content-Type: image/gif");

echo connect('http://freesmsonline.ru/img.gif?sid='.$_GET['sid']);
?>