批量去除PHP文件里的bom代码

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

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PHP, bom