How to solve the problem of Chinese garbled codes in gbk and gb2312 handled by json_encode in php

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This paper describes the solution of json_encode in php to deal with the problem of garbled codes in gbk and gb2312. The specific methods are as follows:

1.json_encode () Chinese is returned as null for Chinese in gbk/gb2312

$arr = array (array ('catid' = >' 44th, 'catname' = >' www.jb51.net', 'meta_title' = >''); echo json_encode ($arr)

Running result:

[{"catid": "4", "catname": "www.jb51.net", "meta_title": null}]

Have you seen "meta_title": null, he used to have a value of "". We checked that the principle is that json_encode only supports uft-8 encoding. Let's convert it.