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Marcos wrote a great post on getting data out of the PI Server using PHP with the Web API a couple years ago.
Hopefully it's helpful for you!
Hello Paul and Niranjan,
I just want to point out that it is not recommended to develop any project with PI SDK anymore. You can find more details on this blog post. As PI AF SDK is not an option for you since PHP is not compatible with .NET libraries, PI Web API seems to be the best option for you since it is platform agnostic. There are other PHP examples in the Developing with PI Web API White Paper and in its respective GitHub repository.