菜鸟问个简单的逻辑问题，求解答
我是想实现62进制的功能，可是下面这段代码只能echo出来，不能返回，不知道是什么原因，求高手解答
<br />
function dwz($id,$str=""){<br />
$a=array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");<br />
$zs=(int)($id/sizeof($a));<br />
$xs=$id%sizeof($a);<br />
if($zs>=sizeof($a)){<br />
$str=$a[$xs].$str;<br />
dwz($zs,$str);<br />
}<br />
else{<br />
if($str==""){<br />
return $a[$zs].$a[$xs];<br />
}<br />
else{<br />
echo $a[$zs].$str;//这里只能输出<br />
return $a[$zs].$str;//返回没值，不知道什么原因<br />
}<br />
}<br />
}<br />
for($i=999990;$i<=1000000;$i++){<br />
echo dwz($i);<br />
echo "<br>";<br />
}<br />
