PHP recursively counts the number of folders and files

<?php
    header(&#39;Content-type:text/html;charset=utf8&#39;);
    /**
    * countDir() 递归统计文件夹数量和文件数量
    * @param $dirname 文件夹名
    * @return $arr 文件夹数量和文件数量
    */
    function countDir($dirname){
        global $dirnum,$filenum;
	if(!file_exists($dirname)){
	    return false;
	}
	$dir = opendir($dirname);
	readdir($dir);
	readdir($dir);
	while($filename = readdir($dir)){
	    $newfile = $dirname.&#39;/&#39;.$filename;
	    if(is_dir($newfile)){
	        countDir($newfile);
		$dirnum++;
	    }else{
	        $filenum++;
	    }
	}
	return array($dirnum,$filenum);
    }
    $a =  countDir(&#39;C:\wamp\www\erhaodian&#39;); 
    var_dump($a);
?>