第十二课 数组循环

1.循环省、市、区数组

<?php
// 导入省市区数组
include_once 'arr.php';
foreach ($arr as $keyProvince => $province) {
    echo $province['area_name'] . '<br>';
    foreach ($province['son'] as $keyCity => $city) {
        echo '----' . $city['area_name'] . '<br>';
        foreach ($city['son'] as $keyCity => $area) {
            echo '----' . '----' . '----' . $area['area_name'] . '<br>';
        }
    }
}

结果：

---

2. 用 echo 输出单个值，用print_r()打印其中一个城市和区

// 用echo打印数组中的“北京”
echo $arr[0]['area_name'];

结果：北京

//用print_r()打印唐山市城市和区
print_r($arr[2]['son'][1]);

结果：

[area_id] => 130200
[area_pid] => 130000
[area_name] => 唐山市
[lng] => 118.175
[lat] => 39.6351
[son] => Array
    (
        [0] => Array
            (
                [area_id] => 130284
                [area_pid] => 130200
                [area_name] => 滦州市
                [lng] => 
                [lat] => 
            )
        [1] => Array
            (
                [area_id] => 130202
                [area_pid] => 130200
                [area_name] => 路南区
                [lng] => 118.154
                [lat] => 39.625
            )
        [2] => Array
            (
                [area_id] => 130203
                [area_pid] => 130200
                [area_name] => 路北区
                [lng] => 118.201
                [lat] => 39.6244
            )
        [3] => Array
            (
                [area_id] => 130204
                [area_pid] => 130200
                [area_name] => 古冶区
                [lng] => 118.458
                [lat] => 39.7199
            )
        [4] => Array
            (
                [area_id] => 130205
                [area_pid] => 130200
                [area_name] => 开平区
                [lng] => 118.262
                [lat] => 39.6713
            )
        [5] => Array
            (
                [area_id] => 130207
                [area_pid] => 130200
                [area_name] => 丰南区
                [lng] => 118.113
                [lat] => 39.5648
            )
        [6] => Array
            (
                [area_id] => 130208
                [area_pid] => 130200
                [area_name] => 丰润区
                [lng] => 118.13
                [lat] => 39.8244
            )
        [7] => Array
            (
                [area_id] => 130209
                [area_pid] => 130200
                [area_name] => 曹妃甸区
                [lng] => 118.46
                [lat] => 39.2731
            )
        [8] => Array
            (
                [area_id] => 130223
                [area_pid] => 130200
                [area_name] => 滦县
                [lng] => 118.703
                [lat] => 39.7406
            )
        [9] => Array
            (
                [area_id] => 130224
                [area_pid] => 130200
                [area_name] => 滦南县
                [lng] => 118.674
                [lat] => 39.5039
            )
        [10] => Array
            (
                [area_id] => 130225
                [area_pid] => 130200
                [area_name] => 乐亭县
                [lng] => 118.912
                [lat] => 39.4256
            )
        [11] => Array
            (
                [area_id] => 130227
                [area_pid] => 130200
                [area_name] => 迁西县
                [lng] => 118.316
                [lat] => 40.1459
            )
        [12] => Array
            (
                [area_id] => 130229
                [area_pid] => 130200
                [area_name] => 玉田县
                [lng] => 117.739
                [lat] => 39.9005
            )
        [13] => Array
            (
                [area_id] => 130281
                [area_pid] => 130200
                [area_name] => 遵化市
                [lng] => 117.964
                [lat] => 40.1874
            )
        [14] => Array
            (
                [area_id] => 130283
                [area_pid] => 130200
                [area_name] => 迁安市
                [lng] => 118.701
                [lat] => 39.9983
            )
    )