How to query if a user is a member of a group?

Drop this into modules/xarpages/xarcustomapi/ismember.php

<?php

 /* ismember

* belongs in roles module

* returns true if user is a member of a group

* args:

* 'uid'        - default: current user OR

* 'uname'      - uname of user, alternative to uid

* 'gid'        - uid of the group OR

* 'group'      - name of group, alternative to gid

*/

 function xarpages_customapi_ismember( $args )

{

	extract($args);

 	$roles = new xarRoles();

 	// get group object

	if (empty($gid) && empty($group)) return;

	if (empty($gid)) {

		$groupobj = $roles->findRole($group);

	}

	else {

		$groupobj = $roles->getRole($gid);

	}

 	// user

	if (empty($uid) && empty($uname)) {

		$uid = xarUserGetVar('uid');

	}

	// get user object

	if (empty($uid)) {

		$userobj = $roles->ufindRole($uname);

	}

	else {

		$userobj = $roles->getRole($uid);

	}

 	// test it

	return $userobj->isAncestor($groupobj);

}

?>