如何在 json 编码字符串内的子数组数据周围添加方括号

发布于03月22日

When trying to access an API the JSON array must be parsed like this

{"item":[{"id":"123456", "name":"adam"}]}

But when i'm doing the following code

$data = array("item" => array("id" => "123456", "name" => "adam"));
echo json_encode($data);

它返回不带方括号的json数组，如下所示

{"item":{"id":"123456","name":"adam"}}

我花了几个小时想办法解决这个问题，就是想不出解决办法

推荐答案

You need to wrap things in another array:

$data = array("item" => array(array("id" => "123456", "name" => "adam")));

This will be more understandable if we use the equivalent PHP 5.4 array syntax:

$data = [ "item" => [ ["id" => "123456", "name" => "adam"] ] ];

Compare this with the JSON:

        { "item":   [ {"id":"123456", "name":"adam"      } ] }

唯一要解释的是为什么其中一个PHP数组在JSON中保持为数组[]，而其他两个则转换为对象{}.但documentation强已经这么做了:

在对数组进行编码时，如果键不是连续的数字从0开始的序列，所有键都编码为字符串，并且 for each 键-值对显式指定.

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