You may face a problem in your code if you are trying to access an AWS S3 bucket which contains period / dot in its name (like my.first.bucket). It gives a fatal error in PHP. This problem actually occurs with some AWS SDKs not all, so the solution is to use an alternate SDK.
Here is the link for new sdk that manages bucket names with dot very well-
https://github.com/aws/aws-sdk-php
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