The OCI8 Extension
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Use the OCI8 extension to access Oracle Database.  

Documentation is at http://php.net/oci8

The extension can be built with PHP versions 4.3.9 to 5.x using Oracle
Database 9.2, 10, 11 or 12 client libraries.  Oracle's standard
cross-version connectivity applies.  For example PHP linked with
Oracle 11.2 client libraries can connect to Oracle Database 9.2
onwards.  See Oracle's note "Oracle Client / Server Interoperability
Support" (ID 207303.1) for details.