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