amazonwebservices/aws-sdk-for-php — pull request #18 by ecaron (2012-01-08 00:25:54+00:00)
Title: CFLoader's autoloader method prevents other autoloaders from working

By design, spl_autoload_register should only return true when it successfully loads the required class otherwise it should return false to let other autoloaders give it a try. Specifically, if SwiftMailer (swiftmailer.org) is invoked after AWS (meaning SwiftMailer's autoloader happens after AWS), an uncatchable error occus because AWS' autoloader always implies that it worked.