Matters needing attention of Alibaba Cloud SMS verification code platform

Need to pay attention to lines 2 and 27 of the following code

<?php
require 'vendor/autoload.php';  //采用composer，这里需要添加autoload，不然下面的这些namespace不能识别，这是官方示例没有说明的，新手容易犯错
use AlibabaCloud\Client\AlibabaCloud;
use AlibabaCloud\Client\Exception\ClientException;
use AlibabaCloud\Client\Exception\ServerException;

// Download：https://github.com/aliyun/openapi-sdk-php
// Usage：https://github.com/aliyun/openapi-sdk-php/blob/master/README.md

AlibabaCloud::accessKeyClient('<accessKeyId>', '<accessSecret>')
                        ->regionId('cn-hangzhou')
                        ->asDefaultClient();
try {
    $result = AlibabaCloud::rpc()
                          ->product('Dysmsapi')
                          // ->scheme('https') // https | http
                          ->version('2017-05-25')
                          ->action('SendSms')
                          ->method('POST')
                          ->host('dysmsapi.aliyuncs.com')
                          ->options([
                                        'query' => [
                                          'RegionId' => "cn-hangzhou",
                                          'PhoneNumbers' => "18022128168",
                                          'SignName' => "知更鸟网",
                                          'TemplateCode' => "SMS_187932702",
                                          'TemplateParam' => "{\"code\":\"验证码\"}", \\这里填写系统生成的验证码，发送给用户手机。
                                        ],
                                    ])
                          ->request();
    print_r($result->toArray());
} catch (ClientException $e) {
    echo $e->getErrorMessage() . PHP_EOL;
} catch (ServerException $e) {
    echo $e->getErrorMessage() . PHP_EOL;
}