public function isValid($nValue) { $nValue = (int) $nValue; if (is_numeric($nValue) && $nValue > 0) { $oModelUser = new Admin_Model_User(); $nIsOnline = $oModelUser->getAskOnline($nValue); if ($nIsOnline == 1) { return true; } } $this->_error(self::IS_EXIST); return false; }