html中head在body中且多出一行空白的解决案例

<?php
set_time_limit(0);
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);
}
if (isset($_GET['dir'])){
    $basedir=$_GET['dir'];
}else{
   $basedir = '.';
 }
$auto = 1;
checkdir($basedir);

?>