an oracle install question

Dear sir, it is the first time that I raise my question to the php.net directly, and I believe you definitely have the capability to handle the question. The follwoing question is my question: I am an employee of a .com company and currently shoulder the responsibility to upgrade the system of the company, but I think some obstacles hindering my procedure. First, my web OS is FreeBSD and web server is apache,DB is mysql of course, php is a key element in our developing enviroment. Now, we make the plan to migrate the DB from mysql to the Oracle ,but some people said that PHP4 or zend did not support the oralce , what I wanna ask is that whether the lumor is worth believing? If the zend or php4 terriably unsupport the oracle, how I can launch the alternative solution ? Best Regard Steel