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<?php  
//使用将此文件放在需要的文件夹下运行此脚本即可
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 ( $charset [3] ) == 191) { // BOM ��ǰ����ַ��ASCII ��ֱ�Ϊ 239 187 191    
    if ($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 );    
}