How to enable oci8 for PHP7.2 on Ubuntu18.10

I am following the this link to enable the oci8 extension for me but I still don't see the oci8 extension enabled in my phpinfo. Any help or step by step guide would be appreciated. I am using PHP7.2 as a service, apache2.4, on Ubuntu18.10 with oracle 11gR2 installed on my local as well

via Chebli Mohamed