隐藏手机号

function hidtel($phone)
    {
        $IsWhat = preg_match('/(0[0-9]{2,3}[-]?[2-9][0-9]{6,7}[-]?[0-9]?)/i', $phone); //固定电话
        if ($IsWhat == 1) {
            return preg_replace('/(0[0-9]{2,3}[-]?[2-9])[0-9]{3,4}([0-9]{3}[-]?[0-9]?)/i', '$1****$2', $phone);
        } else {
            return preg_replace('/(1[3578]{1}[0-9])[0-9]{4}([0-9]{4})/i', '$1****$2', $phone);
        }
    }