_constructFormatterFromConfig example

 'The specified writer';
            /** @see Zend_Log_Exception */
            throw new Zend_Log_Exception("{$writerName} does not extend Zend_Log_Writer_Abstract!");
        }

        if (isset($config['filterName'])) {
            $filter = $this->_constructFilterFromConfig($config);
            $writer->addFilter($filter);
        }

        if (isset($config['formatterName'])) {
            $formatter = $this->_constructFormatterFromConfig($config);
            $writer->setFormatter($formatter);
        }

        return $writer;
    }

    /** * Construct filter object from configuration array or Zend_Config object * * @param array|Zend_Config $config Zend_Config or Array * @return Zend_Log_Filter_Interface * @throws Zend_Log_Exception */