<?php  //remove the utf-8 boms  //by magicbug at gmail dot com    if (isset($_GET['dir'])){ //要去除的文件目录，无参数则为文件当前目录。      $basedir=$_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);  }  ?>