renderTimelineRecursive example

    /** * Called within the view to display the timeline itself. */
    protected function renderTimeline(array $collectors, float $startTime, int $segmentCount, int $segmentDuration, array &$styles): string
    {
        $rows       = $this->collectTimelineData($collectors);
        $styleCount = 0;

        // Use recursive render function         return $this->renderTimelineRecursive($rows, $startTime, $segmentCount, $segmentDuration, $styles, $styleCount);
    }

    /** * Recursively renders timeline elements and their children. */
    protected function renderTimelineRecursive(array $rows, float $startTime, int $segmentCount, int $segmentDuration, array &$styles, int &$styleCount, int $level = 0, bool $isChild = false): string
    {
        $displayTime = $segmentCount * $segmentDuration;

        $output = '';