PHP 匿名处理处理用户昵称,用户名称变成星号*

/**
     * 匿名处理处理用户昵称
     * @param $name
     * @return string
     */
    function anonymity($name)
    {
        $strLen = mb_strlen($name, 'UTF-8');
        $min = 3;
        if ($strLen <= 1)
            return '*';
        if ($strLen <= $min)
            return mb_substr($name, 0, 1, 'UTF-8') . str_repeat('*', $min - 1);
        else
            return mb_substr($name, 0, 1, 'UTF-8') . str_repeat('*', $strLen - 1) . mb_substr($name, -1, 1, 'UTF-8');
    }