检查并清除php文件中bom的函数

3. /**

4. 功能：检测并清除BOM
5. link：bbs.it-home.org
6. */
7. if(isset($_GET['dir'])){
8. $basedir=$_GET['dir'];
9. }else{
10. $basedir = '.';
11. }
12. $auto = 1;
13. checkdir($basedir);

14. function checkdir($basedir){

15. if($dh = opendir($basedir)){
16. while(($file = readdir($dh)) !== false){
17. if($file != '.' && $file != '..'){
18. if(!is_dir($basedir."/".$file)){
19. echo "filename: $basedir/$file ".checkBOM("$basedir/$file")."
    ";
20. }else{
21. $dirname = $basedir."/".$file;
22. checkdir($dirname);
23. }
24. }
25. }//end while
26. closedir($dh);
27. }//end if($dh
28. }//end function

29. function checkBOM($filename){

30. global $auto;
31. $contents = file_get_contents($filename);
32. $charset[1] = substr($contents, 0, 1);
33. $charset[2] = substr($contents, 1, 1);
34. $charset[3] = substr($contents, 2, 1);
35. if(ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191){
36. if($auto == 1){
37. $rest = substr($contents, 3);
38. rewrite ($filename, $rest);
39. return "BOM found, automatically removed.";
40. }else{
41. return ("BOM found.");
42. }
43. }
44. else return ("BOM Not Found.");
45. }

46. function rewrite($filename, $data){

47. $filenum = fopen($filename, "w");
48. flock($filenum, LOCK_EX);
49. fwrite($filenum, $data);
50. fclose($filenum);
51. }
52. ?>

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