php json输出有？？,css样式也不正常,去除php bom头

//只要把此文件另存为removebom.php,放在服务器根目录，然后执行，就可以去除服务器端bom，
//在chrome有小红点的开始

 1 <?php
 2 //remove the utf-8 boms
 3 //by magicbug at gmail dot com
 4 if (isset($_GET['dir'])){ //config the basedir
 5  $basedir=$_GET['dir'];
 6 }else{
 7  $basedir = '.';
 8 } 
 9 $auto = 1; 
10 checkdir($basedir);
11 function checkdir($basedir){
12  if ($dh = opendir($basedir)) {
13   while (($file = readdir($dh)) !== false) {
14    if ($file != '.' && $file != '..'){
15     if (!is_dir($basedir."/".$file)) {
16      echo "filename: $basedir/
17 $file ".checkBOM("$basedir/$file")." <br>";
18     }else{
19      $dirname = $basedir."/".
20 $file;
21      checkdir($dirname);
22     }
23    }
24   }
25  closedir($dh);
26  }
27 }
28 
29 function checkBOM ($filename) {
30  global $auto;
31  $contents = file_get_contents($filename);
32  $charset[1] = substr($contents, 0, 1);
33  $charset[2] = substr($contents, 1, 1);
34  $charset[3] = substr($contents, 2, 1);
35  if (ord($charset[1]) == 239 && ord($charset[2]) == 187 &&
36  ord($charset[3]) == 191) {
37   if ($auto == 1) {
38    $rest = substr($contents, 3);
39    rewrite ($filename, $rest);
40    return ("<font color=red>BOM found, 
41 automatically removed.</font>");
42   } else {
43    return ("<font color=red>BOM found.
44 </font>");
45   }
46  }
47  else return ("BOM Not Found.");
48 }
49 
50 function rewrite ($filename, $data) {
51  $filenum = fopen($filename, "w");
52  flock($filenum, LOCK_EX);
53  fwrite($filenum, $data);
54  fclose($filenum);
55 }
56 ?>