protected function _getSourceFunction($trace)
    {
        $lastTrace = $this->_getLastTrace($trace);

        if (isset($lastTrace['function']) || isset($lastTrace['class'])) {

            $args = '';
            if (isset($lastTrace['args'])) {
                $args = '( ' . count($lastTrace['args']) . ' args' . ' )';
            }

            if (isset($lastTrace['class'])) {
                $function = $lastTrace['class'] . ' ' . $lastTrace['type'] . ' ' . $lastTrace['function'] . ' ' . $args;
            } else {
                $function = $lastTrace['function'] . ' ' . $args;
            }

            return 'Function: ' . $function . '<br />';
        }

        return '';
    }