PHP如何批量检测并去除文件BOM头

2. if (isset($_GET['dir'])) { //设置文件目录
3. $basedir = $_GET['dir'];
4. } else {
5. $basedir = '.';
6. }
7. $auto = 1;
8. checkdir($basedir);
9. function checkdir($basedir)
10. {
11. if ($dh = opendir($basedir)) {
12. while (($file = readdir($dh)) !== false) {
13. if ($file != '.' && $file != '..') {
14. if (!is_dir($basedir . "/" . $file)) {
15. echo "filename: $basedir/$file " . checkBOM("$basedir/$file") . "
    ";
16. } else {
17. $dirname = $basedir . "/" . $file;
18. checkdir($dirname);
19. }
20. }
21. }
22. closedir($dh);
23. }
24. }
25. function checkBOM($filename)
26. {
27. global $auto;
28. $contents = file_get_contents($filename);
29. $charset[1] = substr($contents, 0, 1);
30. $charset[2] = substr($contents, 1, 1);
31. $charset[3] = substr($contents, 2, 1);
32. if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) {
33. if ($auto == 1) {
34. $rest = substr($contents, 3);
35. rewrite($filename, $rest);
36. return ("BOM found, automatically removed.");
37. } else {
38. return ("BOM found.");
39. }
40. } else
41. return ("BOM Not Found.");
42. }
43. function rewrite($filename, $data)
44. {
45. $filenum = fopen($filename, "w");
46. flock($filenum, LOCK_EX);
47. fwrite($filenum, $data);
48. fclose($filenum);
49. }
50. ?>

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