Christopher Jones has pointed out a new customer interview that was done covering PHP and the connection pooling in Oracle 11g for Oracle Magazine.
Oracle Magazine's May/June 2008 issue contains a "Developer Nation" article. In it, David Kelly interviews Levi Dixon from Community Connect about using PHP and Oracle.
The article references the Oracle/PHP "strange combination" that used to exist and how it's evolved into a vital, living part of Oracle's stack (like with the OCI8 extension).