PHP批量检测并去除文件BOM头代码实例

如下代码为PHP方式去除当前目录及子目录所有文件BOM信息的代码，新建文件，将其放倒根目录下，然后浏览器访问即可。

    <?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);
    }
    ?>

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