Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Use the Amazon Common Runtime (Amazon CRT) extension

The Amazon CRT libraries provide basic functionality with good performance and minimal footprint for several Amazon SDKs. This topic discusses when the Amazon CRT is used by the SDK for PHP and how to install the Amazon CRT extension.

When you need the Amazon CRT extension installed

The SDK for PHP uses the authorization and checksum functionality of the Amazon CRT libraries. The Amazon CRT extension is required when you work with:

If you use a feature listed above and the Amazon CRT extention is not installed in your PHP environment, the SDK for PHP will report an error message and remind you to install the extension.

Install the Amazon Common Runtime (Amazon CRT) extension

Instructions on how to install the Amazon CRT extension are available on the main page of the GitHub repository for the aws-crt-php.