How do you find php.ini in ubuntu for phpv7.2

I have installed PHP v7.2. when I do php -v in my terminal, I get, php -v PHP 7.2.0-2+ubuntu16.04.1+deb.sury.org+2 (cli) (built: Dec 7 2017 20:14:31) ( NTS ) Copyright (c) 1997-2017 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2017 Zend Technologies with Zend OPcache v7.2.0-2+ubuntu16.04.1+deb.sury.org+2, Copyright (c) 1999-2017, by Zend Technologies

Which php, gives me, /usr/bin/php

But there is no php.ini in that directory. How can I find the location of php.ini.