function get_target_group($discussion, $targetforum, $aag = true)
{
// Work out target group for move.
$targetgroup = $discussion->get_group_id();
if ($targetforum->get_group_mode() == 0) {
// Target forum doesn't have groups.
$targetgroup = null;
} else {
if (!$targetgroup && $aag && $discussion->get_forum()->get_group_mode() != 0) {
$targetgroup = null;
} else {
if ($targetgroup && $targetforum->get_grouping() != $discussion->get_forum()->get_grouping()) {
// Target forum has groups :( Need to decide a group.
// Had source group, but grouping has changed.
// See if old group belongs to new grouping.
$allowedgroups = groups_get_all_groups($targetforum->get_course_id(), 0, $targetforum->get_grouping(), 'g.id');
if (count($allowedgroups) == 1) {
$targetgroup = key($allowedgroups);
} else {
if (!array_key_exists($targetgroup, $allowedgroups)) {
// Old group not in new grouping, so don't know where to put it.
$targetgroup = null;
}
}
} else {
// Check to see whether a single or multigroup forum.
$groupids = get_allowed_groupids($targetforum, $aag);
if (count($groupids) == 1) {
$targetgroup = key($groupids);
} else {
if (!array_key_exists($targetgroup, $groupids)) {
$targetgroup = null;
}
}
}
}
}
return $targetgroup;
}
} else {
$targetgroups[0] = 0;
}
} else {
if (count($targetgroups) == 0) {
$targetgroups[0] = 0;
} else {
$multigroups = 1;
}
}
}
$targetgroupdiff = 1;
$groupsfound = true;
$options = array();
if ($targetgroupmode) {
$options = get_allowed_groupids($targetforum, false);
// Need to find the difference between original groups and options.
// See http://www.php.net/manual/en/function.array-diff.php .
$result = array_diff($targetgroups, $options);
$targetgroupdiff = count($result);
$optionsnum = count($options);
// Check to see whether we have some matching groups.
$optionsdiff = count(array_diff($options, $targetgroups));
if ($optionsnum === $optionsdiff) {
// No groups found.
$groupsfound = false;
}
}
if (!$chosentargetgroup && $targetgroup > 0 && !$groupsfound) {
// Target group set from source forum, but not in target - ensure choice given.
$targetgroup = 0;
