class Foo {

    public $settings, $options;

    public function __construct() {
        $this->settings = array(
            'distro'    => '',
            'pkg_mgr'   => '',
            'options'   => array(1, 2, 3)
        );
    }

    public function get_options() {
        $options = $this->settings['options'];
        foreach($options as $v) {
            $this->options[] = $v;
        }
        return $this->options;
    }

}

$foo = new Foo();
print_r($foo->get_options());