I am trying to do the following

functions.php

class Test {

    public function hello(){
        return 'Hello';
    }

}
$test = new Test();

header.php or any other include

echo $test->hello();

But it is not accessible unless I define it as:

global $test;
echo $test->hello();

I really do not want this as I will end up with many variables to define. Is there anyway to make class object and methods being accessible from any include?

Thank you so much.

---

UPDATE, POSSIBLE SOLUTION

At the end I did the following:

functions.php

Included the class with require.

Added a function that returns instantiation of specific class

function test(){
    return new Test();  
}

And then it's methods become accessible from anywhere: includes, templates just like this:

header.php or any custom include or template

echo test()->hello();

That does work and I do not need to use $GLOBALS, I just hope I am not doing something awkward in terms of WordPress.

Would you approve that?