How to delete folders recursively in php

<?php
// $dir：要删除的文件的目录
function recursiveDelete($dir){ 
// 打开指定目录 
        if ($handle = @opendir($dir)) { 
            while (($file = readdir($handle)) !== false) {
                   if (($file == ".") || ($file == "..")) { continue; }
                   if (is_dir($dir . &#39;/&#39; . $file)) {
                         // 递归 
                         recursiveDelete($dir . &#39;/&#39; . $file); 
                   } else { 
                         unlink($dir . &#39;/&#39; . $file); 
                         // 删除文件 
                  } 
            } 
           @closedir($handle); 
           rmdir ($dir); 
      }
}