PHP去除BOM文档

2. //remove the utf-8 boms
3. //by magicbug at gmail dot com
5. if (isset($_GET['dir'])){ //要去除的文件目录，无参数则为文件当前目录。
6. $basedir=$_GET['dir'];
7. }else{
8. $basedir = '.';
9. }
11. $auto = 1;
13. checkdir($basedir);
15. function checkdir($basedir){
16. if ($dh = opendir($basedir)) {
17. while (($file = readdir($dh)) !== false) {
18. if ($file != '.' && $file != '..'){
19. if (!is_dir($basedir."/".$file)) {
20. echo "filename: $basedir/$file ".checkBOM("$basedir/$file")."
    ";
21. }else{
22. $dirname = $basedir."/".
23. $file;
24. checkdir($dirname);
25. }
26. }
27. }
28. closedir($dh);
29. }
31. function checkBOM ($filename) {
32. global $auto;
33. $contents = file_get_contents($filename);
34. $charset[1] = substr($contents, 0, 1);
35. $charset[2] = substr($contents, 1, 1);
36. $charset[3] = substr($contents, 2, 1);
37. if (ord($charset[1]) == 239 && ord($charset[2]) == 187 &&
38. ord($charset[3]) == 191) {
39. if ($auto == 1) {
40. $rest = substr($contents, 3);
41. rewrite ($filename, $rest);
42. return ("BOM found,automatically removed.");
43. } else {
44. return ("BOM found.");
45. }
46. }
47. else return ("BOM Not Found.");
48. }
50. function rewrite ($filename, $data) {
51. $filenum = fopen($filename, "w");
52. flock($filenum, LOCK_EX);
53. fwrite($filenum, $data);
54. fclose($filenum);
55. }
56. ?>

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PHP, BOM