Gazelle/classes/inbox.class.php

<?php
#declare(strict_types=1);

class Inbox
{
    /*
     * Get the link to a user's inbox.
     * This is what handles the ListUnreadPMsFirst setting
     *
     * @param string - whether the inbox or sentbox should be loaded
     * @return string - the URL to a user's inbox
     */
    public static function get_inbox_link($WhichBox = 'inbox')
    {
        $ListFirst = isset(G::$LoggedUser['ListUnreadPMsFirst']) ? G::$LoggedUser['ListUnreadPMsFirst'] : false;

        if ($WhichBox === 'inbox') {
            if ($ListFirst) {
                $InboxURL = 'inbox.php?sort=unread';
            } else {
                $InboxURL = 'inbox.php';
            }
        } else {
            if ($ListFirst) {
                $InboxURL = 'inbox.php?action=sentbox&amp;sort=unread';
            } else {
                $InboxURL = 'inbox.php?action=sentbox';
            }
        }
        return $InboxURL;
    }
}