How to convert Chinese to ascii in php

How to convert Chinese to ascii: First create a PHP sample file; then define a "strtoascii" method; then use the "mb_convert_encoding" function to convert the encoding; finally execute the file and output the conversion result.

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

public function strtoascii($str){
        $str=mb_convert_encoding($str,'GB2312');
        $change_after='';
        for($i=0;$i
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