PHP implements partial character hiding (hide the middle part of the mobile phone number and only keep the beginning and end of the string)

This article mainly talks about using PHP to implement some character hiding codes. It has certain reference value. Interested friends can learn about it.

/**
 * 隐藏部分字符串
 * # 此方法多用于手机号码或身份证号、银行卡号的中间部分数字的隐藏
 */
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;
}

/**
 * 只保留字符串首尾字符，隐藏中间用*代替（两个字符时只显示第一个）
 * @param string $user_name 姓名
 * @return string 格式化后的姓名
 */
function substr_cut($user_name){
    $strlen   = mb_strlen($user_name, 'utf-8');
    $firstStr   = ucfirst(strtolower(mb_substr($user_name, 0, 3, 'utf-8')));
    $lastStr   = strtolower(substr($user_name, -3));
    if($strlen == 2){
        $hideStr = str_repeat('*', strlen($user_name, 'utf-8') - 1);
        $result = $firstStr . $hideStr ;
    }else {
        $hideStr = substr(str_repeat("*", $strlen - 6), 0, 3);
        $result = $firstStr . $hideStr . $lastStr;
    }
    return $result;
}

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