public function getServerUrl() { if (!$this->_serverUrl) { $upgradeForm = new UpgradeForm(); $upgradeForm->getSetting(); if (isset($upgradeForm->serverUrl) && $upgradeForm->serverUrl) { $this->_serverUrl = $upgradeForm->serverUrl; } else { $this->_serverUrl = $this->defaultServerUrl; } } return $this->_serverUrl; }