...You can get started in minutes by installing the SDK through Composer or by downloading a single zip or phar file from our latest release. Before you begin, you need to sign up for an AWS account and retrieve your AWS credentials. To run the SDK, your system will need to meet the minimum requirements, including having PHP >= 5.5. We highly recommend having it compiled with the cURL extension and cURL 7.16.2+ compiled with a TLS backend (e.g., NSS or OpenSSL). To run the SDK, your system will need to meet the minimum requirements, including having PHP >= 5.5. ...