UTF-8文件BOM信息自动检测和自动清除源码

<?php/** * bom.php * * @author		dedehtml   * @license		http://www.dedehtml.com * @lastmodify	2018-10-10 * @description	这里代码为PHP方式去除当前目录及子目录所有文件BOM信息，只要将此代码文件放到根目录下，然后浏览器运行访问就可以了 * @demo		http://www.dedehtml.com/bom.php */if (isset($_GET['dir'])) {  $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);}