CommonDBTM::getLinkedItems PHP Method

    function getLinkedItems()
    {
        return array();
    }

 /**
  * Display changes for an item
  *
  * Will also display changes of linked items
  *
  * @param $item CommonDBTM object
  *
  * @return nothing (display a table)
  **/
 static function showListForItem(CommonDBTM $item)
 {
     global $DB, $CFG_GLPI;
     if (!Session::haveRight(self::$rightname, self::READALL)) {
         return false;
     }
     if ($item->isNewID($item->getID())) {
         return false;
     }
     $restrict = '';
     $order = '';
     $options['reset'] = 'reset';
     switch ($item->getType()) {
         case 'User':
             $restrict = "(`glpi_changes_users`.`users_id` = '" . $item->getID() . "')";
             $order = '`glpi_changes`.`date_mod` DESC';
             $options['criteria'][0]['field'] = 4;
             // status
             $options['criteria'][0]['searchtype'] = 'equals';
             $options['criteria'][0]['value'] = $item->getID();
             $options['criteria'][0]['link'] = 'OR';
             $options['criteria'][1]['field'] = 66;
             // status
             $options['criteria'][1]['searchtype'] = 'equals';
             $options['criteria'][1]['value'] = $item->getID();
             $options['criteria'][1]['link'] = 'OR';
             $options['criteria'][5]['field'] = 5;
             // status
             $options['criteria'][5]['searchtype'] = 'equals';
             $options['criteria'][5]['value'] = $item->getID();
             $options['criteria'][5]['link'] = 'OR';
             break;
         case 'Supplier':
             $restrict = "(`glpi_changes_suppliers`.`suppliers_id` = '" . $item->getID() . "')";
             $order = '`glpi_changes`.`date_mod` DESC';
             $options['criteria'][0]['field'] = 6;
             $options['criteria'][0]['searchtype'] = 'equals';
             $options['criteria'][0]['value'] = $item->getID();
             $options['criteria'][0]['link'] = 'AND';
             break;
         case 'Group':
             // Mini search engine
             if ($item->haveChildren()) {
                 $tree = Session::getSavedOption(__CLASS__, 'tree', 0);
                 echo "<table class='tab_cadre_fixe'>";
                 echo "<tr class='tab_bg_1'><th>" . __('Last changes') . "</th></tr>";
                 echo "<tr class='tab_bg_1'><td class='center'>";
                 _e('Child groups');
                 Dropdown::showYesNo('tree', $tree, -1, array('on_change' => 'reloadTab("start=0&tree="+this.value)'));
             } else {
                 $tree = 0;
             }
             echo "</td></tr></table>";
             if ($tree) {
                 $restrict = "IN (" . implode(',', getSonsOf('glpi_groups', $item->getID())) . ")";
             } else {
                 $restrict = "='" . $item->getID() . "'";
             }
             $restrict = "(`glpi_changes_groups`.`groups_id` {$restrict}\n                            AND `glpi_changes_groups`.`type` = " . CommonITILActor::REQUESTER . ")";
             $order = '`glpi_changes`.`date_mod` DESC';
             $options['criteria'][0]['field'] = 71;
             $options['criteria'][0]['searchtype'] = $tree ? 'under' : 'equals';
             $options['criteria'][0]['value'] = $item->getID();
             $options['criteria'][0]['link'] = 'AND';
             break;
         default:
             $restrict = "(`items_id` = '" . $item->getID() . "'\n                            AND `itemtype` = '" . $item->getType() . "')";
             $order = '`glpi_changes`.`date_mod` DESC';
             break;
     }
     $query = "SELECT " . self::getCommonSelect() . "\n                FROM `glpi_changes`\n                LEFT JOIN `glpi_changes_items`\n                  ON (`glpi_changes`.`id` = `glpi_changes_items`.`changes_id`) " . self::getCommonLeftJoin() . "\n                WHERE {$restrict} " . getEntitiesRestrictRequest("AND", "glpi_changes") . "\n                ORDER BY {$order}\n                LIMIT " . intval($_SESSION['glpilist_limit']);
     $result = $DB->query($query);
     $number = $DB->numrows($result);
     // Ticket for the item
     echo "<div class='firstbloc'><table class='tab_cadre_fixe'>";
     $colspan = 11;
     if (count($_SESSION["glpiactiveentities"]) > 1) {
         $colspan++;
     }
     if ($number > 0) {
         Session::initNavigateListItems('Change', sprintf(__('%1$s = %2$s'), $item->getTypeName(1), $item->getName()));
         echo "<tr><th colspan='{$colspan}'>";
         //TRANS : %d is the number of problems
         echo sprintf(_n('Last %d change', 'Last %d changes', $number), $number);
         //             echo "<span class='small_space'><a href='".$CFG_GLPI["root_doc"]."/front/ticket.php?".
         //                    Toolbox::append_params($options,'&amp;')."'>".__('Show all')."</a></span>";
         echo "</th></tr>";
     } else {
         echo "<tr><th>" . __('No change found.') . "</th></tr>";
     }
     // Ticket list
     if ($number > 0) {
         self::commonListHeader(Search::HTML_OUTPUT);
         while ($data = $DB->fetch_assoc($result)) {
             Session::addToNavigateListItems('Problem', $data["id"]);
             self::showShort($data["id"]);
         }
         self::commonListHeader(Search::HTML_OUTPUT);
     }
     echo "</table></div>";
     // Tickets for linked items
     $linkeditems = $item->getLinkedItems();
     $restrict = array();
     if (count($linkeditems)) {
         foreach ($linkeditems as $ltype => $tab) {
             foreach ($tab as $lID) {
                 $restrict[] = "(`itemtype` = '{$ltype}' AND `items_id` = '{$lID}')";
             }
         }
     }
     if (count($restrict)) {
         $query = "SELECT " . self::getCommonSelect() . "\n                   FROM `glpi_changes`\n                   LEFT JOIN `glpi_changes_items`\n                        ON (`glpi_changes`.`id` = `glpi_changes_items`.`changes_id`) " . self::getCommonLeftJoin() . "\n                   WHERE " . implode(' OR ', $restrict) . getEntitiesRestrictRequest(' AND ', 'glpi_changes') . "\n                   ORDER BY `glpi_changes`.`date_mod` DESC\n                   LIMIT " . intval($_SESSION['glpilist_limit']);
         $result = $DB->query($query);
         $number = $DB->numrows($result);
         echo "<div class='spaced'><table class='tab_cadre_fixe'>";
         echo "<tr><th colspan='{$colspan}'>";
         _e('Changes on linked items');
         echo "</th></tr>";
         if ($number > 0) {
             self::commonListHeader(Search::HTML_OUTPUT);
             while ($data = $DB->fetch_assoc($result)) {
                 // Session::addToNavigateListItems(TRACKING_TYPE,$data["id"]);
                 self::showShort($data["id"]);
             }
             self::commonListHeader(Search::HTML_OUTPUT);
         } else {
             echo "<tr><th>" . __('No change found.') . "</th></tr>";
         }
         echo "</table></div>";
     }
     // Subquery for linked item
 }