php检测图片木马

1. /**
2. +------------------------------------------------------------------------------
3. * Upload 文件上传类
4. +------------------------------------------------------------------------------
5. * @package Upload
6. * @author nicegy
7. * @version $Id: Upload.class.php 2014-4-11 19:00:23 nicegy $
8. +------------------------------------------------------------------------------
9. */
10. class Upload {
12. private static $image = null;
13. private static $status = 0;
14. private static $suffix = null;
15. private static $imageType = array('.jpg', '.bmp','.gif','.png');
16. private static $message = array(
17. '0' => '没有错误发生，文件上传成功。',
18. '1' => '上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。',
19. '2' => '上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。',
20. '3' => '文件只有部分被上传。',
21. '4' => '没有文件上传。',
22. '5' => '未能通过安全检查的文件。',
23. '6' => '找不到临时文件夹。',
24. '7' => '文件写入失败。',
25. '8' => '文件类型不支持',
26. '9' => '上传的临时文件丢失。',
27. );
29. //@ 开始执行文件上传
30. public static function start($feild = 'file') {
31. if (!empty($_FILES)) {
32. self::$status = $_FILES[$feild]['error'];
33. if (self::$status > 0)
34. return array('status' => self::$status, 'msg' => self::$message[self::$status]);
35. self::$image = $_FILES[$feild]['tmp_name'];
36. self::$suffix = strtolower(strrchr($_FILES[$feild]['name'], '.'));
37. return array('status' => self::_upload(), 'path' => self::$image, 'msg' => self::$message[self::$status]);
38. } else {
39. return array('status' => self::$status, 'msg' => self::$message[self::$status]);
40. }
41. }
43. //@ 私有 上传开始
44. private static function _upload($path = './upload/') {
45. date_default_timezone_set('PRC');
46. $newFile = $path . date('Y/m/d/His') . rand(100, 999) . self::$suffix;
47. self::umkdir(dirname($newFile));
48. if (is_uploaded_file(self::$image) && move_uploaded_file(self::$image, $newFile)) {
49. self::$image = $newFile;
50. if (in_array(self::$suffix, self::$imageType))
51. return self::checkHex();
52. else
53. return self::$status = 0;
54. } else {
55. return self::$status = 9;
56. }
57. }
59. //@ 私有 16进制检测 黑客
60. private static function checkHex() {
61. if (file_exists(self::$image)) {
62. $resource = fopen(self::$image, 'rb');
63. $fileSize = filesize(self::$image);
64. fseek($resource, 0);
65. if ($fileSize > 512) { // 取头和尾
66. $hexCode = bin2hex(fread($resource, 512));
67. fseek($resource, $fileSize - 512);
68. $hexCode .= bin2hex(fread($resource, 512));
69. } else { // 取全部
70. $hexCode = bin2hex(fread($resource, $fileSize));
71. }

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