Get all constants from class

Question

Possible Duplicate:
Can I get CONST's defined on a PHP class?

Is it possible to fetch all defined constants from class ? I.e. I have following class:

class Cl {
    const AAA = 1;
    const BBB = 2;
}

and I would like to get an array:

array (
    'AAA' => 1,
    'BBB' => 2,
)