Copy array in a class

Ok, as your probably aware Im new to OOP in PHP, so trying to figure things out one at a time.

Im trying to pass an array into a constructor, and copy that array into a variable in the class, so I can use it in another function, so to test:-

class protoMenu{
    private $menuArray;
    function protoMenu($arrMenu) {
        $menuArray = $arrMenu;
        $this->drawMenu();
    }

    private function drawMenu() {
        var_dump($menuArray);
    }
}

$Menu = new protoMenu(array("divContentsID" => "divMenuContents", "divMenuID" => "divMenu"));

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Looking at array copying Im doing everything right, but its not working