How to transfer php to GB2312 in English?

when you use iconv to convert English aaa to GB2312, the output is still aaa, to find a solution, or, English and numbers to gb2312, or the same as before

Php
Apr.22,2022

utf8 and gbk are both ASCII encoded

compatible.

gbk

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utf8

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ascii

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e651c1-45b14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e651c1-45b14.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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