简单的数组递归算法

	$city = array('beijing','heibei'=>array('shijiazhuang','chengde'),'shanxi'=>array('xian','huashan'),'shanghai');
	test($city);
	function test($params)
	{
		if(!is_array($params))
		{
			return;
		}
		foreach ($params as $key => $value) {
			if(is_array($value)){
				test($value);
			}else{
				echo $value."  ";
			}
		}
	}

输出结果

beijing  shijiazhuang  chengde  xian  huashan  shanghai