## 一、概述 在 php5.2.0 及以上版本已经内置 JSON 扩展 ## 二、JSON 函数  ~~~ <?php $arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5); echo json_encode($arr); ?> ~~~ 输出； ~~~ {"a":1,"b":2,"c":3,"d":4,"e":5} ~~~ ``` <?php    $json \= '{"a":1,"b":2,"c":3,"d":4,"e":5}';    var\_dump(json\_decode($json));    var\_dump(json\_decode($json, true)); ?> ```