php检测图片木马

实践php检测图片木马

        /**
      +------------------------------------------------------------------------------
    * 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

php