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With PI Web API, the following blog is helpful. Using PI Web API, the application can get PI System's values by https protocol. It works without any installation.
If you have reasons that you could not use PI Web API and wants to use PI OLEDB, PI ODBC, I found following information. These are just php's information to use ODBC, OLEDB drivers.
PHP: odbc_connect - Manual (ODBC)
I need to mention that I have not tried it yet though.