Insert part of web page

I'm new to php and html.

INB4: I HAVE TO use php, so please, don't advice me to choose another language.

I'm using bootstrap to build my web project. All my pages have a NavBar, contents of which are different depending on the users role. So I made a web page, including php scripts, which forms that NavBar for each user. And I want to know, Is there any easy way to put that php+html code in specific part of web page? Elseway I have to put a code of it in every page, which is not very good.