Connect to Mysql from Openshift by PHP

I used OpenShift recently and I want to connect to mysql but I don’t know how to connect (about the parameters) .
I use mysqli command :
I don’t know what is host name,username and password . I’'m newbie so I hope everything will help me !
Thanks … :smile:

A post was merged into an existing topic: I didn’t receive any php error in Openshift!