Install RocketMQ PHP SDK via Composer for 4.x - ApsaraMQ for RocketMQ

Set up the required dependencies before using the ApsaraMQ for RocketMQ 4.x SDK for PHP to send and subscribe to messages.

Prerequisites

Before you begin, make sure that you have:

PHP 5.5.0 or later installed. For download and installation instructions, see Installation and Configuration.
Composer installed. For download instructions, see Install Composer.

Verify your PHP version:

php -v

Important

If your PHP version is earlier than 7.2.5, you must downgrade Composer to version 2.2.x or earlier. Later Composer versions are not compatible with PHP versions below 7.2.5.

Install the SDK

Add the aliyunmq/mq-http-sdk dependency to the composer.json file in your PHP installation directory:
```
{
     "require": {
       "aliyunmq/mq-http-sdk": ">=1.0.4"
     }
   }
```
Install the dependency:
```
composer install
```
Composer downloads the SDK package to the vendor/ directory.

What's next

Send messages
Subscribe to messages