php获取文件夹及子文件夹大小的代码

<?php
/**
 * 获取文件夹及子文件夹大小
* by www.jbxue.com
*/
function holdersize($hold,$holdersize=0){
     if (@$handle = opendir($hold)) {
          while (false !== ($file = readdir($handle))) {
                     if ($file != "." && $file != "..") {
                               if(is_dir($hold.'/'.$file)) holdersize($hold.'/'.$file,$holdersize);
                             $holdersize=$holdersize+filesize($hold.'/'.$file);
                            }
                 }
            return $holdersize;
      }else return '无法获取'.$hold.'目录';
}
?>