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：/article/