二维数组
$arr=array("city1"=>"北京","city2"=>"上海","city3"=>array("拉萨","普罗旺斯"));
foreach($arr as $k => $v) {
if($k != "city3"){
echo "<br/>";
echo $v;
}else{
//双层循环数组
foreach($v as $kk=>$vv){
echo "<br/>";
echo $vv;}}}
//循环多维数组
//引入文件
include "adress.php";
foreach($adress as $k => $v) {
echo"省名：". $v["province_name"]."<br/>";
if(!empty($v["city"])) {
foreach($v["city"] as $key => $val) {
echo" 市名：". $val["city_name"]."<br/>";
if(!empty($val["area"])) {
foreach($val["area"] as $kk => $vv) {
echo" 区名：". $vv."<br/>";}}}}}
