How to convert string to ASCII in php

php method to convert a string to ASCII: [public function strtoascii($str{ $str=mb_convert_encoding($str,'GB2312');$change_after='';for(...] .

The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.

Conversion between string and ASCII:

The following functions have been encapsulated and can be used directly.

1. Convert the string (also practical in Chinese) to ascii (note: I default to the current php file environment of 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;$i<strlen($str);$i++){
            $temp_str=dechex(ord($str[$i]));
            $change_after.=$temp_str[1].$temp_str[0];
        }
        return strtoupper($change_after);
    }

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

public function asciitostr($sacii){
        $asc_arr= str_split(strtolower($sacii),2);
        $str='';
        for($i=0;$i<count($asc_arr);$i++){
            $str.=chr(hexdec($asc_arr[$i][1].$asc_arr[$i][0]));
        }
        return mb_convert_encoding($str,&#39;UTF-8&#39;,&#39;GB2312&#39;);
    }

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