PHP实例:检测并清除文件开头的BOM信息

2. ini_set('memory_limit', '-1');
3. /*检测并清除BOM*/
4. $basedir = dirname(__FILE__);//扫描当前文件路径 可自动设置
5. $auto = 1;
6. checkdir($basedir);
7. function checkdir($basedir){
8. if($dh = opendir($basedir)){
9. while(($file = readdir($dh)) !== false){
10. if($file != '.' && $file != '..'){
11. if(!is_dir($basedir."/".$file)){
12. echo "filename: $basedir/$file ".checkBOM("$basedir/$file")."
    ";
13. }else{
14. $dirname = $basedir."/".$file;
15. checkdir($dirname);
16. }
17. }
18. }//end while
19. closedir($dh);
20. }//end if($dh
21. }//end function
22. function checkBOM($filename){
23. global $auto; // bbs.it-home.org
24. $contents = file_get_contents($filename);
25. $charset[1] = substr($contents, 0, 1);
26. $charset[2] = substr($contents, 1, 1);
27. $charset[3] = substr($contents, 2, 1);
28. if(ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191){
29. if($auto == 1){
30. $rest = substr($contents, 3);
31. rewrite ($filename, $rest);
32. return "BOM found, automatically removed.";
33. }else{
34. return ("BOM found.");
35. }
36. }
37. else return ("BOM Not Found.");
38. }//end function
39. function rewrite($filename, $data){
40. $filenum = fopen($filename, "w");
41. flock($filenum, LOCK_EX);
42. fwrite($filenum, $data);
43. fclose($filenum);
44. }//end function

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