PHP对象 - 替代使用方式

I want to use a class method in multiple files. Instead of declaring an object in each file, is it possible to create the object in a function and use this function where I need it?

Example:

class Test_Class {

    public function test_method() {
        // something
    }

}

function Test_Class_Init(){
    $test_class = new Test_Class();
    return $test_class;
}

Then call the method in this way in each file:

Test_Class_Init()->test_method();

If your method is not reliant on any other data in the class, you could consider declaring it as static...

class Test_Class {
    public static function test_method() {
        echo "Hello";
    }
}

you can then call it just referencing the class...

Test_Class::test_method();