关于 array_pad函数的疑义

关于 array_pad函数的疑问

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php $city=array('li','yang','wang');array_pad($city,5,'xie');foreach($city as $value){    print $value;}?>

为什么输出结果是“liyangwang”
不应该是”liyangwangxiexie“吗

------解决方案--------------------
$city = array_pad($city,5,'xie');