class data {
    var $dir = 'D:wamp4wwwbegin';

    public function scandir_through($dir)
     {
         $items = glob($dir . '/*');
         for ($i = 0; $i < count($items); $i++) {
             if (is_dir($items[$i])) {
                 $add = glob($items[$i] . '/*');
                 $items = array_merge($items, $add);
             }
         }
        return $items;
     }

    public function main()
    {
        $scan_tree = $this->scandir_through($dir);
        echo "<ul id='booklist'>"."</n>";
        foreach ($scan_tree as $key=>$file){
            $url = $file;
            $xml = simplexml_load_file($url);
               $book_count = count($xml->book);
               for($i = 0; $i < $book_count; $i++) {
                   $book = $xml->book[$i];
                   $title=$xml->book[$i]->title;
                   $author=$xml->book[$i]->author;
                   //echo '</br>';
                   //echo $file. " &nbsp   ";
                   //echo $title. " &nbsp   ";
                   //echo $author;
                   echo "<li><div class='file'>".$file."</div>
                   <div class='title'>".$title."</div>
                   <div class='author'>".$author."</div></li></n>";
               }
         }
          echo "</ul>";
    }
}
$d = new data();
$d->main();
?>

$scan_tree = $this->scandir_through($this->dir);

public function main()

public function main($dir)

$d->main($dir);