Помогите!

11 Янв 2015
Народ в этом коде есть шелл не могли бы вы его найти????
Плиз)

<?php
if (!empty($_GET['src'])) {
    if (mysql_num_rows(mysql_query("SELECT * FROM `users` WHERE `avatar` = '". filter($_GET['src']) ."' LIMIT 1")) != 1) {
        exit('Такого изображения не существует.');
    }
    $src = filter($_GET['src']);
    $name = strtolower($src);
    if (preg_match('#.jpe?g$#i', $name)) $f = 'jpg';
    elseif (preg_match('#.png$#i', $name)) $f = 'png';
    elseif (preg_match('#.gif$#i', $name)) $f = 'gif';
}
if ($_GET['t'] != 'a' && $_GET['t'] != 'b') {
    exit('Неправильный параметр.');
}
$size = getimagesize('design/imgs/avatars/'. $src);
if ($f == 'jpg') $img = imagecreatefromjpeg('design/imgs/avatars/'. $src);
elseif ($f == 'png') $img = imagecreatefrompng('design/imgs/avatars/'. $src);
elseif ($f == 'gif') $img = imagecreatefromgif('design/imgs/avatars/'. $src);
$w_src = imagesx($img);
$h_src = imagesy($img);
if ($_GET['t'] == 'a') {
    $width = 100;
    $height = 50;
    $ratio = $w_src/$width;
    $ratio2 = $h_src/$height;
    if ($ratio > $ratio2) {
        $w_dest = round($w_src/$ratio);
        $h_dest = round($h_src/$ratio);
    } elseif ($ratio < $ratio2) {
        $w_dest = round($w_src/$ratio2);
        $h_dest = round($h_src/$ratio2);
    }
    $image = imagecreatetruecolor($w_dest, $h_dest);
    if ($f == 'png') imagealphablending($image, false);
    if ($f == 'gif') {
        $tsi = imagecolortransparent($img);
        if ($tsi >= 0 && $tsi < 255) {
            $tc = imagecolorsforindex($img, $tsi);
            $tdi = imagecolorallocate($image, $tc['red'], $tc['green'], $tc['blue']);
            imagefill($image, 0, 0, $tdi);
            imagecolortransparent($image, $tdi);
        }
    }
    imagecopyresampled($image, $img, 0, 0, 0, 0, $w_dest, $h_dest, $w_src, $h_src);
    if ($f == 'png') imagesavealpha($image, true);
    header('Content-type: image/'. $f);
    if ($f == 'jpg') imagejpeg($image, '', '100');
    elseif ($f == 'png') imagepng($image);
    elseif ($f == 'gif') imagegif($image, '', '100');
    imagedestroy($image);
    imagedestroy($img);
}
if ($_GET['t'] == 'b') {
    $width = 32;
    $ratio = $w_src/$width;
    $w_dest = round($w_src/$ratio);
    $h_dest = round($h_src/$ratio);
    $image = imagecreatetruecolor($w_dest, $w_dest);
    if ($f == 'png') imagealphablending($image, false);
    if ($f == 'gif') {
        $tsi = imagecolortransparent($img);
        if ($tsi >= 0 && $tsi < 255) {
            $tc = imagecolorsforindex($img, $tsi);
            $tdi = imagecolorallocate($image, $tc['red'], $tc['green'], $tc['blue']);
            imagefill($image, 0, 0, $tdi);
            imagecolortransparent($image, $tdi);
        }
    }
    if ($w_src > $h_src) imagecopyresampled($image, $img, 0, 0, round((max($w_src, $h_src) - min($w_src, $h_src))/2), 0, $width, $width, min($w_src, $h_src), min($w_src, $h_src));
    elseif ($w_src < $h_src) imagecopyresampled($image, $img, 0, 0, 0, round((max($w_src, $h_src) - min($w_src, $h_src))/2), $width, $width, min($w_src, $h_src), min($w_src, $h_src));
    elseif ($w_src == $h_src) imagecopyresampled($image, $img, 0, 0, 0, 0, $width, $width, $w_src, $w_src);
    if ($f == 'png') imagesavealpha($image, true);
    header('Content-type: image/'. $f);
    if ($f == 'jpg') imagejpeg($image, '', '100');
    elseif ($f == 'png') imagepng($image);
    elseif ($f == 'gif') imagegif($image, '', '100');
    imagedestroy($image);
    imagedestroy($img);
}
?>