pfSense

function gateway_is_gwgroup_member($name) {

	global $config;

	if (is_array($config['gateways']['gateway_group']))

		$groups = $config['gateways']['gateway_group'];

	else

		return false;

	$members = array();

	foreach($groups as $group) {

		if (is_array($group['item'])) {

			foreach($group['item'] as $item) {

				$elements = explode("|", $item);

				$gwname = $elements[0];

				if ($name == $elements[0])

					$members[] = $group['name'];

			}

		}

	}

	return $members;

}