The ingroup() function determines whether the specified user is a member of the specified group.
result = ingroup(user, group);
|users||Required. A username.|
|group||Required. A group name.|
|true||User is a member of group.|
|false||User is not a member of group or the user or group is null or invalid.|
result = ingroup("user1", "admgroup");
In this example, result contains an integer value 1 if user1 belongs to the group admgroup. result contains an integer value 0 if user1 does not belong to group admgroup.