Accessing attributes and methods of instantiated class in another class

You can use namespace to use classes in other files.

use RaizDaPasta\pastaDaClasse\Classe;

Within your file where you make use instantiate a new object and use the function you want

I do not really understand what you want to do, but I think it should look something like this:

<?php

class Apresentar
{
    public function __construct(ControllerUsuario $usuario)
    {
        echo $usuario->getUsuario();
    }
}

class ControllerUsuario
{
    private $usuario = 'Fábio';

    public function getUsuario()
    {
        return $this->usuario;
    }
}

new Apresentar(new ControllerUsuario);