实践php检测图片木马

    <?php         /**         +------------------------------------------------------------------------------       * Upload 文件上传类         +------------------------------------------------------------------------------       * @package   Upload       * @author    nicegy        * @version   $Id: Upload.class.php 2014-4-11 19:00:23 nicegy $         +------------------------------------------------------------------------------       */        class Upload {                       private static $image = null;              private static $status = 0;              private static $suffix = null;              private static $imageType = array('.jpg', '.bmp','.gif','.png');              private static $message = array(                    '0' => '没有错误发生，文件上传成功。',                    '1' => '上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。',                    '2' => '上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。',                    '3' => '文件只有部分被上传。',                    '4' => '没有文件上传。',                    '5' => '未能通过安全检查的文件。',                    '6' => '找不到临时文件夹。',                    '7' => '文件写入失败。',                    '8' => '文件类型不支持',                    '9' => '上传的临时文件丢失。',              );                       //@ 开始执行文件上传              public static function start($feild = 'file') {                    if (!empty($_FILES)) {                        self::$status = $_FILES[$feild]['error'];                       if (self::$status > 0)                              return array('status' => self::$status, 'msg' => self::$message[self::$status]);                          self::$image = $_FILES[$feild]['tmp_name'];                          self::$suffix = strtolower(strrchr($_FILES[$feild]['name'], '.'));                          return array('status' => self::_upload(), 'path' => self::$image, 'msg' => self::$message[self::$status]);                   } else {                          return array('status' => self::$status, 'msg' => self::$message[self::$status]);                   }        }                     //@ 私有 上传开始            private static function _upload($path = './upload/') {                date_default_timezone_set('PRC');                $newFile = $path . date('Y/m/d/His') . rand(100, 999) . self::$suffix;                self::umkdir(dirname($newFile));                if (is_uploaded_file(self::$image) && move_uploaded_file(self::$image, $newFile)) {                    self::$image = $newFile;                    if (in_array(self::$suffix, self::$imageType))                        return self::checkHex();                    else                        return self::$status = 0;                } else {                    return self::$status = 9;                }            }                     //@ 私有 16进制检测 黑客            private static function checkHex() {                if (file_exists(self::$image)) {                    $resource = fopen(self::$image, 'rb');                    $fileSize = filesize(self::$image);                    fseek($resource, 0);                    if ($fileSize > 512) { // 取头和尾                        $hexCode = bin2hex(fread($resource, 512));                        fseek($resource, $fileSize - 512);                        $hexCode .= bin2hex(fread($resource, 512));                    } else { // 取全部                        $hexCode = bin2hex(fread($resource, $fileSize));                    }                    fclose($resource);                    /* 匹配16进制中的 */                    /* 匹配16进制中的 */                    /* 匹配16进制中的