How to convert php characters to ascii?

How to convert characters to ascii in php: first define two integer variables a and A, and save the ASCII codes of the corresponding letters; then define the character variable ch, and assign the capital letter A to the integer variable A; Finally, convert A to ASCII code.

How to convert characters to ascii in php:

Convert a string (also practical in Chinese) to ascii

Note: I default that our current php file environment is UTF-8. If it is GBK, the mb_convert_encoding operation is not required

public function strtoascii($str){
        $str=mb_convert_encoding($str,'GB2312');
        $change_after='';
        for($i=0;$i<strlen($str);$i++){
            $temp_str=dechex(ord($str[$i]));
            $change_after.=$temp_str[1].$temp_str[0];
        }
        return strtoupper($change_after);
    }

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