public function getMaxId() { $oModelNavigationMenu = new Admin_Model_NavigationMenu(); $oModelNavigationSubmenu = new Admin_Model_NavigationSubmenu(); $oModelNavigationSubsubmenu = new Admin_Model_NavigationSubsubmenu(); $aAllIds = array($oModelNavigationMenu->getLastRow()->id, $oModelNavigationSubmenu->getLastRow()->id, $oModelNavigationSubsubmenu->getLastRow()->id); return max($aAllIds) + 1; }