TicketTemplateMandatoryField::post_purgeItem PHP Метод

    function post_purgeItem()
    {
        global $DB;
        parent::post_purgeItem();
        $ticket = new Ticket();
        $itemtype_id = $ticket->getSearchOptionIDByField('field', 'itemtype', 'glpi_tickets');
        $items_id_id = $ticket->getSearchOptionIDByField('field', 'items_id', 'glpi_tickets');
        // Try to delete itemtype -> delete items_id
        if ($this->fields['num'] == $itemtype_id) {
            $query = "SELECT `id`\n                   FROM `" . $this->getTable() . "`\n                   WHERE `" . static::$items_id . "` = '" . $this->fields['tickettemplates_id'] . "'\n                         AND `num` = '{$items_id_id}'";
            if ($result = $DB->query($query)) {
                if ($DB->numrows($result)) {
                    $a = new self();
                    $a->delete(array('id' => $DB->result($result, 0, 0)));
                }
            }
        }
    }