BuddyPress.org

Hi Andrea,

Maybe not the most straightforward method, but a loop roughly like this would do it:
`if ( bp_group_has_members( array( ‘group_id’ => $group_x_id, ‘per_page’ => 100000 ) ) ) {
while ( bp_group_members() ) {
bp_group_the_member();

$user_id = bp_get_group_member_id();

// Don’t do this if the user is already a member
if ( groups_is_user_member( $user_id, $group_y_id ) ) {

$new_member = new BP_Groups_Member;
$new_member->group_id = $group_y_id;
$new_member->user_id = $user_id;
$new_member->inviter_id = 0;
$new_member->is_admin = 0;
$new_member->user_title = ”;
$new_member->date_modified = bp_core_current_time();
$new_member->is_confirmed = 1;

$new_member->save();

groups_update_groupmeta( $group_y_id, ‘total_member_count’, (int) groups_get_groupmeta( $group_y_id, ‘total_member_count’) + 1 );
}
}
}`

I haven’t tested that, but something very much like it should work.