用php把utf8的中的BOM去掉

作者/来源：yixinu.com

栏目：运维/编程

日期：2014-07-02 08:01:24

这段php程序如下，保存成php文件放在根目录中执行一次就行了，会自动去除文件头中的BOM。

 //remove the utf-8 boms
 //by magicbug at gmail dot com
  
 if (isset($_GET['dir'])){ //config the basedir
     $basedir=$_GET['dir'];
 }else{
     $basedir = '.';
 } 
  
 $auto = 1; 
  
 checkdir($basedir);
  
 function checkdir($basedir){
     if ($dh = opendir($basedir)) {
         while (($file = readdir($dh)) !== false) {
             if ($file != '.' && $file != '..'){
                 if (!is_dir($basedir."/".$file)) {
                     echo "filename: $basedir/$file ".checkBOM("$basedir/$file")." <br>";
                 }else{
                     $dirname = $basedir."/".$file;
                     checkdir($dirname);
                 }
             }
         }
     closedir($dh);
     }
 }
  
 function checkBOM ($filename) {
     global $auto;
     $contents = file_get_contents($filename);
     $charset[1] = substr($contents, 0, 1); 
     $charset[2] = substr($contents, 1, 1); 
     $charset[3] = substr($contents, 2, 1); 
     if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) {
         if ($auto == 1) {
             $rest = substr($contents, 3);
             rewrite ($filename, $rest);
             return ("<font color=red>BOM found, automatically removed.</font>");
         } else {
             return ("<font color=red>BOM found.</font>");
         }
     } 
     else return ("BOM Not Found.");
 }
  
 function rewrite ($filename, $data) {
     $filenum = fopen($filename, "w");
     flock($filenum, LOCK_EX);
     fwrite($filenum, $data);
     fclose($filenum);
 }