PHP批量检测并去除文件BOM头信息代码

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") . "
";
                } 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._http://www.111com.net");
        } 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);
}
?>

header('content-Type: text/html; charset=utf-8');
$auto=1;/*设置为1标示检测BOM并去除，设置为0标示只进行BOM检测，不去除*/
$basedir='.';
$loop=true;//www.111com.net echo '当前查找的目录为：'.$basedir.'当前的设置是：';
echo '（1）',$loop?'检查当前目录以及当前目录的子目录':'只针对当前目录进行检测';
echo '（2）',$auto?'检测文件BOM同时去除检测到BOM文件的BOM
':'只检测文件BOM不执行去除BOM操作
';

checkdir($basedir,$loop);
function checkdir($basedir='',$loop=true){
 $basedir=empty($basedir)?'.':$basedir;
 if($dh=opendir($basedir)){
  while (($file=readdir($dh))!==false){
   if($file!='.'&&$file!='..'){
    if(!is_dir($basedir.'/'.$file)){
     echo '文件: '.$basedir.'/'.$file .checkBOM($basedir.'/'.$file).'
';
    }else{
     if(!$loop) continue;
     $dirname=$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 (' 找到BOM并已自动去除');
  }else{
   return (' 找到BOM');
  }
 }else{
  return (' 没有找到BOM');
 }
}
function rewrite($filename,$data){
 $filenum=fopen($filename,'w');
 flock($filenum,LOCK_EX);
 fwrite($filenum,$data);
 fclose($filenum);
}