php数组循环

数组循环

省市县的循环

$arr = $arr = [
    [
        'area_id' => 110000,
        'area_pid' => 0,
        'area_name' => '北京',
        'lng' => 116.405,
        'lat' => 39.905,
        'son' => [
            [
                'area_id' => 110100,
                'area_pid' => 110000,
                'area_name' => '北京市',
                'lng' => 116.405,
                'lat' => 39.905,
                'son' => [
                    [
                        'area_id' => 110101,
                        'area_pid' => 110100,
                        'area_name' => '东城区',
                        'lng' => 116.41,
                        'lat' => 39.9316
                    ],
                    [
                        'area_id' => 110102,
                        'area_pid' => 110100,
                        'area_name' => '西城区',
                        'lng' => 116.36,
                        'lat' => 39.9305
                    ]
                    //具体数据省略。。。
                ]
            ]
        ]
    ]
    //, 具体数据省略。。。
];
$txt="      ";//输出多个空格
$space = str_replace(chr(32),' ',$txt);
foreach ($arr as $key => $value) {//循环省
    echo $value['area_name']."<br>"; //输出省名称
    foreach ($value['son'] as $k => $v) {//循环市
        echo $space.$v['area_name']."<br>";//输出市名称
        foreach ($v['son'] as $k1 => $v1) {//循环区县
            echo $space.$space.$v1['area_name']."<br>"; //输出区县名称
        }
    }
}

运行结果：