HowTo connect to Firebird from Delphi for Php

Here is the tutorial

Firebird is supported by PHP, and Delphi for PHP can support it, but it can’t out of the box.
What is not well documented about a Delphi for PHP to Firebird connection, is the fact that names of libraries can overlap in WIndows.
In this first post, I’d put a foreword to clarify situation.