<?php  if (isset($_GET[‘dir‘])){ //设置文件目录  $basedir=$_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);  }  ?>