Yes require the first file into the second. That’s all.
See an example below,
File1.php :
<?php
function first($int, $string){ //function parameters, two variables.
return $string; //returns the second argument passed into the function
}
Now Using require
(http://php.net/require) to require the File1.php
to make its content available for use in the second file:
File2.php :
<?php
require __DIR__ . '/File1.php';
echo first(1, "omg lol"); //returns omg lol;