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PHP determines the file type by taking the binary file header

Source: Internet
Author: User
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PHP determines the file type by taking the binary file header

  2. /**
  3. * PHP uses 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); // read-only 2 bytes
  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 Keywords:
wordpress the field php read binary file php encrypt binary file php file download header php binary file php header download file php header file

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