Following this tutorial, Ｉ have done these:
1. Downloaded Oracle Instant Client. Added the path.
2. OCI8 was installed when I install Wamp. I uncommitted the line in php.ini.
3. Restarted the whole wamp.
----The problem now seems to be OCI8 was not configured correctly so I got the error "Call to undefined function oci_connect() ".
I am guessing I need to install Instant Client correctly in order to use OCI8. In this instruction, it says:
But where do I type this? What am I missing?