help with boolean

[eluser]KrizzAngel[/eluser]
constructor?? i dont know if u guys gets what i mean hehe..
i just dont know how "return" value works..
for example i was coding my index() function.
i wrote

function index()
{
$this->checker();
$this->load->view('home.php');
}

does this mean that if the checker returns true it will continue to load the home page?? what if its false..
how can i express the other code so that it will load another page if its false/