批量去除BOM头

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"; 
        }
        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, $rest); 
      return ("
BOM found, automatically removed.
"); 
    } 
    else { 
      return ("
BOM found.
"); 
    } 
  } 
  else return ("
BOM Not Found.
"); 
} 
function rewrite ($filename, $data) { 
  $filenum = fopen($filename, "w"); 
  flock($filenum, LOCK_EX); 
  fwrite($filenum, $data); 
  fclose($filenum); 
}