<?php if (class_exists('\Aws\Sdk')) { var_dump(\Aws\Sdk::VERSION); // ver3.x } elseif (class_exists('\Aws\Common\Aws')) { var_dump(\Aws\Common\Aws::VERSION); // ver2.x } Register as a new user and use Qiita more conveniently You get articles that match your needsYou can efficiently read back useful informationWhat you can do with signing up