How to convert UTF-8 to gb2312

How to convert UTF-8 to gb2312cnt is a UTF-8 encoded webpage parameter passed through the address. iconv and mb_convert_encoding are used to convert $ cnt = iconv ("UTF-8", "gb2312 // IGNORE ", $ _ GET ['cnt ']); how to convert UTF-8 to gb2312
Cnt is a UTF-8 encoded URL-based parameter,
Convert using iconv and mb_convert_encoding
$ Cnt = iconv ("UTF-8", "gb2312 // IGNORE", $ _ GET ['cnt ']);

$ Cnt = mb_convert_encoding ($ _ GET ['cnt '], "gb2312", "UTF-8 ");


However, the Chinese characters displayed by var_dump ($ cnt) are all changed into boxes. how can this problem be converted? Share:
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What is the encoding format of your file?
For gb2312
Add: header ("content-type: text/html; charset = gb2312 ");
Then var_dump ()
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$ Cnt = iconv ("UTF-8", "gb2312 // IGNORE", $ _ GET ['cnt ']);

// $ Cnt = mb_convert_encoding ($ _ GET ['cnt '], "gb2312", "UTF-8 ");

Are squares displayed in both ways?
Is your file encoded as gb2312.
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Save the file as ANSI
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First determine what is passed in
Echo base64_encode ($ _ GET ['cnt ']);
Paste the result to help you analyze it