How to convert php ascii to Chinese

php How to convert ascii to Chinese: First create a PHP sample file; then define an asciitostr method; then convert ascii to Chinese through functions such as "mb_convert_encoding".

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Convert ascii to string (Chinese is also practical) (note : I default that our current php file environment is UTF-8. If it is GBK, the mb_convert_encoding operation is not needed)

public function asciitostr($sacii){
        $asc_arr= str_split(strtolower($sacii),2);
        $str='';
        for($i=0;$i
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