获取 JSON 数组的值

Question

这是我拥有的 json 数组，我使用 php 的 json_decode() 对其进行解码

{"form":{"fieldsets":[{"fieldset_name":"name_1","datapoints":{"dp_id_1":1,"dp_id_2":4}},{"fieldset_name":"name_2","datapoints":{"dp_id_3":1,"dp_id_4":5}}]}}.

解码后得到的数组是

Array ( 
    [form] => Array ( 
        [fieldsets] => Array ( 
            [0] => Array ( 
                [fieldset_name] => name_1 
                [datapoints] => Array ( 
                    [dp_id_1] => 1 
                    [dp_id_2] => 4 
                ) 
            ) 
            [1] => Array ( 
                [fieldset_name] => name_2 
                [datapoints] => Array ( 
                    [dp_id_3] => 1 
                    [dp_id_4] => 5 
                ) 
            ) 
        ) 
    ) 
) 

现在我想将数据点数组 dp_id_1,dp_id_2 元素推入一个数组，并将 dp_id_3,dp_id_4 推入另一个数组

请帮帮我…………

Answer 1

简单地遍历数组：

$points = array();

for($array['form']['fieldsets'] as $set) {
    $points = array_merge($points, $set['datapoints']);
}

更新：

关于你的编辑，那就更简单了。将正文替换为：

$points[] = $set['datapoints'];

我建议阅读arrays in PHP 以更好地了解它们的工作原理。