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It sounds like a library mismatch issue. Having both a 10.2 (the XE
install) and the 11.1 libraries might be causing a clash. The error
seems rare. There was one old report of the problem in
I'd step back and make a decision about which client libraries you
want to use.
I expect the WAMP install uses a version of the OCI8 DLL that was
compiled with 10gR2 libraries. So it should run with the XE or the
11g instant client, because there is backward compatibility.
If PHP runs with the libraries in the XE install you can still connect
to your XE DB or your remote 11g DB.
Let us know what you find.