src/Debug/Output/File.php
public function onLog(Event $event)
    {
        if (!$this->fileHandle) {
            return;
        }
        $method = $event['method'];
        if ($method == 'groupUncollapse') {
            return;
        }
        $args = $event['args'];
        $meta = $event['meta'];
        $isSummaryBookend = $method == 'groupSummary' || !empty($meta['closesSummary']);
        if ($isSummaryBookend) {
            \fwrite($this->fileHandle, "=========\n");
            return;
        }
        if ($args) {
            $str = $this->processLogEntryWEvent($method, $args, $meta);
            \fwrite($this->fileHandle, $str);
        } elseif ($method == 'groupEnd' && $this->depth > 0) {
            $this->depth --;
        }
    }
public function onLog(Event $event)
    {
        if (!$this->fileHandle) {
            return;
        }
        $method = $event['method'];
        if ($method == 'groupUncollapse') {
            return;
        }
        $args = $event['args'];
        $meta = $event['meta'];
        $isSummaryBookend = $method == 'groupSummary' || !empty($meta['closesSummary']);
        if ($isSummaryBookend) {
            \fwrite($this->fileHandle, "=========\n");
            return;
        }
        if ($args) {
            $str = $this->processLogEntryWEvent($method, $args, $meta);
            \fwrite($this->fileHandle, $str);
        } elseif ($method == 'groupEnd' && $this->depth > 0) {
            $this->depth --;
        }
    }
debug.log event subscriber

@param Event $event debug.log event object

@return void