Merge pull request #246 from aliyun/JacksonTian-patch-1

Update OpenAPI portal link

Author: peze

README.md

@@ -20,8 +20,7 @@ Alibaba Cloud Client for PHP is a client tool that helps PHP developers manage c
 [Troubleshoot](https://troubleshoot.api.aliyun.com/?source=github_sdk) Provide OpenAPI diagnosis service to help developers locate quickly and provide solutions for developers through `RequestID` or `error message`.
 
 ## Online Demo
-[API Developer Portal](https://next.api.aliyun.com) provides the ability to call the cloud product OpenAPI online, and dynamically generate SDK Example code and quick retrieval interface, which can significantly reduce the difficulty of using the cloud API.
-
+[Alibaba Cloud OpenAPI Developer Portal](https://next.api.aliyun.com/) provides the ability to call the cloud product OpenAPI online, and dynamically generate SDK Example code and quick retrieval interface, which can significantly reduce the difficulty of using the cloud API.
 
 ## Prerequisites
 Your system will need to meet the [Prerequisites](/docs/en-US/0-Prerequisites.md), including having PHP >= 5.5. We highly recommend having it compiled with the cURL extension and cURL 7.16.2+.
@@ -139,7 +138,7 @@ Please make sure to read the [Contributing Guide](/CONTRIBUTING.md) before makin
 
 ## References
 * [Alibaba Cloud Regions & Endpoints][endpoints]
-* [OpenAPI Explorer][open-api]
+* [Alibaba Cloud OpenAPI Developer Portal][open-api]
 * [Packagist][packagist]
 * [Composer][composer]
 * [Guzzle Documentation][guzzle-docs]
@@ -153,7 +152,7 @@ Copyright (c) 2009-present, Alibaba Cloud All rights reserved.
 
 
 [SDK]: https://github.com/aliyun/openapi-sdk-php
-[open-api]: https://api.alibabacloud.com
+[open-api]: https://next.api.aliyun.com/
 [latest-release]: https://github.com/aliyun/openapi-sdk-php-client
 [guzzle-docs]: http://docs.guzzlephp.org/en/stable/request-options.html
 [composer]: https://getcomposer.org