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PHP takes binary file header to determine file type

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Release： 2016-07-25 08:54:08
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  2. /**
  3. * PHP takes the binary file header to quickly determine the file type
  4. *
  5. * @param file $file
  6. * @return string
  7. * @author lrenwang
  8. * @blog blog.lrenwang.com
  9. */
  10. function get_extname($file)
  11. {
  12. $fp = fopen($file, "rb");
  13. $bin = fread($fp, 2); //只读2字节
  14. fclose($fp);
  15. $bin_info = @unpack("C2chars", $bin);
  16. $code = intval($bin_info['chars1'].$bin_info['chars2']);
  17. switch ($code) {
  18. case 7790:
  19. $type = 'exe';
  20. break;
  21. case 7784:
  22. $type = 'midi';
  23. break;
  24. case 8075:
  25. $type = 'zip';
  26. break;
  27. case 8297:
  28. $type = 'rar';
  29. break;
  30. case 255216:
  31. $type = 'jpg';
  32. break;
  33. case 7173:
  34. $type = 'gif';
  35. break;
  36. case 6677:
  37. $type = 'bmp';
  38. break;
  39. case 13780:
  40. $type = 'png';
  41. break;
  42. default:
  43. $type = $code;
  44. break;
  45. }
  46. return $type;
  47. }
  48. ?>
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Related labels：
PHP取二进制文件头判断文件类型
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