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php检测上传excel文件类型的示例代码

时间：2021-07-01 10:21:17 帮助过：8人阅读

  2. /**
  3. * Detect upload file type
  4. * 检测上传文件的excel文件类型
  5. * @param array $file
  6. * @return bool $flag
  7. * @site bbs.it-home.org
  8. */
  9. private function detectUploadFileMIME($file) {
  10. // 1.through the file extension judgement 03 or 07
  11. $flag = 0;
  12. $file_array = explode ( ".", $file ["name"] );
  13. $file_extension = strtolower ( array_pop ( $file_array ) );
  15. // 2.through the binary content to detect the file
  16. switch ($file_extension) {
  17. case "xls" :
  18. // 2003 excel
  19. $fh = fopen ( $file ["tmp_name"], "rb" );
  20. $bin = fread ( $fh, 8 );
  21. fclose ( $fh );
  22. $strinfo = @unpack ( "C8chars", $bin );
  23. $typecode = "";
  24. foreach ( $strinfo as $num ) {
  25. $typecode .= dechex ( $num );
  26. }
  27. if ($typecode == "d0cf11e0a1b11ae1") {
  28. $flag = 1;
  29. }
  30. break;
  31. case "xlsx" :
  32. // 2007 excel
  33. $fh = fopen ( $file ["tmp_name"], "rb" );
  34. $bin = fread ( $fh, 4 );
  35. fclose ( $fh );
  36. $strinfo = @unpack ( "C4chars", $bin );
  37. $typecode = "";
  38. foreach ( $strinfo as $num ) {
  39. $typecode .= dechex ( $num );
  40. }
  41. echo $typecode;
  42. if ($typecode == "504b34") {
  43. $flag = 1;
  44. }
  45. break;
  46. }
  48. // 3.return the flag
  49. return $flag;
  50. }

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