php检测上传excel文件类型的示例代码

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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