用PHP检测并去掉UTF-8中的BOM

甜思思

　　<?php
/*清除rom*/
if(isset($_GET['dir'])){
     $basedir=$_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($dirname);
                 }
             }
         }//end while
     closedir($dh);
     }//end if($dh
}//end function
function checkBOM($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, $rest);
             return "<font color=red>BOM found, automatically removed.</font>";
         }else{
             return ("<font color=red>BOM found.</font>");
         }
     }    
     else return ("BOM Not Found.");
}//end function
function rewrite($filename, $data){
     $filenum = fopen($filename, "w");
     flock($filenum, LOCK_EX);
     fwrite($filenum, $data);
     fclose($filenum);
}

?>