PHP: Список воспроизведения mp3 xml

$dir = 'directory_of_mp3_files'; 
$file_type = 'mp3'; 
$play_list = "<\? xml version='1.0' encoding='UTF-8' standalone='yes'?>"; 
$play_list .= "<playlist>"; 

if (is_dir($dir)) { 
  if ($dh = opendir($dir)) { 
   while (($file = readdir($dh)) !== false) { 
     if ($file != '.' && $file != '..') { 
      $name_array = explode('.', $file); 
      // if file has .mp3 extension 
      if ($name_array[1] == $file_type) { 
        $play_list .= '<song>'; 
        $file = "$dir/$file";
        $play_list .= '<file>' . $file . '</file>'; 
        $mp3 = fopen($file, "r"); 
        fseek($mp3, -128, SEEK_END); 
        $tag = fread($mp3, 3); 
        // if id3 tag is found... 
        if ($tag == "TAG") { 
          $play_list .= '<title>' . trim(fread($mp3, 30)) . '</title>'; 
          $play_list .= '<artist>' . trim(fread($mp3, 30)) .'</artist>'; 
        // if no id3 tag... 
        } else { 
          $play_list .= '<title>unknown title</title>'; 
          $play_list .= '<artist>unknown artist</artist>'; 
        } 
        // close file 
        fclose($mp3); 
        $play_list .= '</song>'; 
      } 
     } 
   } 
   // close directory 
   closedir($dh); 
   $play_list .= '</playlist>'; 
   // echo the xml file 
   echo "$play_list"; 
  } 
}