php 脱敏(手机号脱敏 , 姓名)

脱敏在工作中很常见 , 比如把 张三展示成张* , 17767779777展示成177****9777

    /**
     * 脱敏
     *
     * @authors: Msy
     * @Created-Time: 2022/10/17 17:54
     * @param $string 需要脱敏的字符
     * @param $start  开始位置
     * @param $length 脱敏长度
     * @param $re     替换字符
     * @return string
     */
    public function desensitize($string, $start = 0, $length = 0, $re = '*'){
        if(empty($string) || empty($length) || empty($re)) return $string;
        $end = $start + $length;
        $strlen = mb_strlen($string);
        $str_arr = array();
        for($i=0; $i=$start && $i&$v){
            $len = mb_strlen($v['realName']);
            if ($len == 2){
                $v['realName'] = $this->desensitize($v['realName'],0,1);
            }else{
                $v['realName'] = $this->desensitize($v['realName'],1,1);
            }

            $v['mobile'] = $this->desensitize($v['mobile'],3,4);
        }