MyBB: Get unique UIDS from posts on a specific page

mybb_get-unique-uids.txt

$plugins->add_hook('showthread_start', 'plugin_showthread_start');
$plugins->add_hook('showthread_end', 'plugin_showthread_end');
$plugins->add_hook('postbit', 'plugin_postbit');

function plugin_showthread_start()
{
    global $unique_uids;

    $unique_uids = [];
    // Other showthread_start code
}

function plugin_showthread_end()
{
    global $db, $unique_uids;

    if (empty($unique_uids)) {
        return;
    }

    // Do something with the unique users who have posts on this page
    $users = implode(',', array_map('intval', $unique_uids));
    $query = $db->simple_select('users', 'uid, username', "uid IN ({$users})");

    while($user = $db->fetch_array($query))
    {
        // ['uid', 'username']
        // Alternatively, store user data alongside UID in $unique_uids
    }
}

function plugin_postbit($post)
{
    global $unique_uids;

    if ($post['uid'] && !in_array($post['uid'], $unique_uids)) {
        $unique_uids[] = $post['uid'];
    }
}