[Marco van Herwaarden]

I got a better solution for you

Do the following modifications in your includes/adminfunctions_user.php (2 edits) and you will be able to select your users for the mailing also based on secondary membergroups.

In file includes/adminfunctions_user.php

Find:

PHP Code:

        print_membergroup_row($vbphrase['primary_usergroup'], 'user[usergroupid]', 2, $userarray); 


Add under:

PHP Code:

        // Start hack MarcoH64
        print_membergroup_row($vbphrase['additional_usergroups'], 'user[membergroupids]', 2, $userarray);
        // End hack MarcoH64 


In the same file find:

PHP Code:

    if (is_array($user['usergroupid']))
    { // for emails
        foreach($user['usergroupid'] AS $id)
        {
            $u_condition[] = "usergroupid = $id";
        } 


REPLACE by:

PHP Code:

    // Start hack MarcoH64
    if (is_array($user['usergroupid']) OR is_array($user['membergroupids']))
    { // for emails
        if (is_array($user['usergroupid']))
        {
            foreach($user['usergroupid'] AS $id)
            {
                $u_condition[] = "usergroupid = $id";
            }
        }
        if (is_array($user['membergroupids']))
        {
            foreach($user['membergroupids'] AS $id)
            {
                $u_condition[] = "find_in_set($id, membergroupids)";
            }
        }
        // End hack MarcoH64 


As usual test first on a test board, only limited tested by me.