src/Debug/Debug.php
public function groupSummary($priority = 0)
    {
        // "use" our function params so things don't complain
        array($priority);
        $args = \func_get_args();
        $meta = $this->internal->getMetaVals(
            $args,
            array('channel' => $this->cfg['channel']),
            array('priority' => 0),
            array('priority')
        );
        $this->data['groupPriorityStack'][] = $meta['priority'];
        $this->setLogDest('summary');
        /*
            Publish the debug.log event (regardless of cfg.collect)
            don't actually log
        */
        $this->internal->publishBubbleEvent(
            'debug.log',
            $this,
            array(
                'method' => __FUNCTION__,
                'args' => array(),
                'meta' => $meta,
            )
        );
    }
public function groupSummary($priority = 0)
    {
        // "use" our function params so things don't complain
        array($priority);
        $args = \func_get_args();
        $meta = $this->internal->getMetaVals(
            $args,
            array('channel' => $this->cfg['channel']),
            array('priority' => 0),
            array('priority')
        );
        $this->data['groupPriorityStack'][] = $meta['priority'];
        $this->setLogDest('summary');
        /*
            Publish the debug.log event (regardless of cfg.collect)
            don't actually log
        */
        $this->internal->publishBubbleEvent(
            'debug.log',
            $this,
            array(
                'method' => __FUNCTION__,
                'args' => array(),
                'meta' => $meta,
            )
        );
    }
Initiate the beginning of "summary" log entries

Debug methods called while a groupSummary is open will appear at the top of the log
call groupEnd() to close summary

groupSummary can be used multiple times
All groupSummary groups will appear together in a single group

@param integer $priority (0) The higher the priority, the ealier it will appear.

@return void