How to hide some characters in php

How to implement partial character hiding in php: First create a PHP sample file; then define a "func_substr_replace" method; then use "mb_strlen" and other functions to hide some characters in the middle of the string.

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php hides the middle characters of the string

Often when the winning list is announced, in order to avoid exposing the winner’s mobile phone number, the middle part of the number is hidden, such as: 139****2972. This article simply shares a piece of PHP implementation code. Great God It can be ignored and the rookie continues.

// 隐藏部分字符串
function func_substr_replace($str, $replacement = '*', $start = 1, $length = 3)
{
    $len = mb_strlen($str,'utf-8');
    if ($len > intval($start+$length)) {
        $str1 = mb_substr($str,0,$start,'utf-8');
        $str2 = mb_substr($str,intval($start+$length),NULL,'utf-8');
    } else {
        $str1 = mb_substr($str,0,1,'utf-8');
        $str2 = mb_substr($str,$len-1,1,'utf-8');    
        $length = $len - 2;        
    }
    $new_str = $str1;
    for ($i = 0; $i < $length; $i++) { 
        $new_str .= $replacement;
    }
    $new_str .= $str2;
    return $new_str;
}

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