json_decode() 使用总结

最新推荐文章于 2025-05-19 10:19:59 发布

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#php #json

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本文深入探讨了PHP中JSON编码与解码的细节，包括如何使用json_encode和json_decode处理数组与对象，以及如何通过参数控制输出格式。

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json使用总结

1、php json_encode() 返回 [] 与 {}

json_decode() 原样输出：
encode之前是数组，decode为数组；
encode之前是对象，decode为对象；
json_decode(a, true) 数组格式输出

<?php
       $a = [
            ['a','b','c'],
            [],
            [1,2,3]
        ];
        $b = json_encode($a);
        // [["a","b","c"],[],[1,2,3]]
        $c = json_encode($a, JSON_FORCE_OBJECT);
        // {"0":{"0":"a","1":"b","2":"c"},"1":{},"2":{"0":1,"1":2,"2":3}}
?>

<?php
print_r(json_decode($b));
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [1] => Array
        (
        )

    [2] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )
)
?>

<?php
print_r(json_decode($b, true));
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [1] => Array
        (
        )

    [2] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )
)
?>

<?php
print_r(json_decode($c));
stdClass Object
(
    [0] => stdClass Object
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [1] => stdClass Object
        (
        )

    [2] => stdClass Object
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )
)
?>

<?php
print_r(json_decode($c,true));
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
            [2] => c
        )

    [1] => Array
        (
        )

    [2] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )
)
?>

参考：https://www.codelovers.cn/article/20180629104213.html