<?php
// file.php stored somewhere on server
    $name = "Eduardo";
    $age = 37;
?>

<?php
// main.php stored somewhere on server and includes file.php
    echo "Person's name and age: ";
    
    include "file.php";
    
    echo $name . ", " . $age;
// output is 'Person's name and age: Eduardo, 37
?>