How to replace asterisk in Chinese in php

php method to replace asterisks with Chinese: 1. Determine whether the characters contain Chinese characters; 2. Use the mb_substr function to replace the specified Chinese part with asterisks.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to replace asterisks in Chinese in php?

PHP user names are processed with asterisks

PHP user names are processed with * signs:

User names: English, Chinese, mixed Chinese and English, Chinese and English The

processing of mixed characters is as follows: the first letter and the end are retained, and the middle is replaced by an * (one character is displayed directly, two characters: Zhang*, three or more characters: Song*Dan)

First determine whether the characters contain Chinese characters, and if so, use the mb_ series of functions (the Chinese here uses UTF-8 format)

UTF-8 Chinese regular: "/[\x{4e00} -\x{9fa5}] /u"

GB2312 Chinese regular: "/[".chr(0xa1)."-".chr(0xff)."] /"

 //判断是否包含中文字符
if(preg_match("/[\x{4e00}-\x{9fa5}]+/u", $str)) {
    //按照中文字符计算长度
    $len = mb_strlen($str, 'UTF-8');
    //echo '中文';
    if($len >= 3){
        //三个字符或三个字符以上掐头取尾，中间用*代替
        $str = mb_substr($str, 0, 1, 'UTF-8') . '*' . mb_substr($str, -1, 1, 'UTF-8');
    } elseif($len == 2) {
        //两个字符
        $str = mb_substr($str, 0, 1, 'UTF-8') . '*';
    }
} else {
    //按照英文字串计算长度
    $len = strlen($str);
    //echo 'English';
    if($len >= 3) {
        //三个字符或三个字符以上掐头取尾，中间用*代替
        $str = substr($str, 0, 1) . '*' . substr($str, -1);
    } elseif($len == 2) {
        //两个字符
        $str = substr($str2, 0, 1) . '*';
    }
}

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