How to hide some characters in a string in php

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, hoping to help Everyone.

// 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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