I need to parse a variable from language

i would like to create a php page and load a variable from the language variables into it.

i know how to call the smarty method to display the language variable

say i create a new variable in the language called “terms”

let assume terms= “these are the terms i want you to read.”

smarty viable = {$lang.terms}

what includes do i need to put in php file for this to work?

i dont necessarily have to use smarty method, but i do have to use the variable from the language i create …thanks