The AWS SDK for PHP getting started guide mentions:

To use the AWS SDK for PHP, you must be using PHP version 5.5.0 or later with the SimpleXML PHP extension enabled. If you need to sign private Amazon CloudWatch URLs, you also need the OpenSSL PHP extension.

1. What are private Amazon CloudWatch URLs?
2. Is OpenSSL required when using the AWS SDK for PHP?

CodePudding user response：

Unfortunately, that looks like a typographical error in the documentation as private Amazon CloudWatch URLs do not exist.

It probably meant to say sign Amazon CloudFront URLs for private distributions which you can find more about here & in specific to PHP, here.

And no - if you do not need to create signed URLs, there should be no need for the OpenSSL PHP extension when using the AWS SDK for PHP.