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哪位高手知道php哪个版本开始支持json_encode函数的

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Release： 2016-06-13 13:37:36
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谁知道php哪个版本开始支持json_encode函数的？
昨天在一台非常老的机器上面跑php，发现程序有些功能不行了，查询居然不支持json_encode函数
再看php版本是：5.1.6

谁知道php哪个版本开始支持json_encode函数的？

------解决方案--------------------
5.2，没手册吗

自己写一个，网上也有的

Related labels：
encode json php
source：php.cn
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