FluidTYPO3\Vhs\ViewHelpers\Iterator\ForViewHelper::render PHP Method

    public function render()
    {
        $to = intval($this->arguments['to']);
        $from = intval($this->arguments['from']);
        $step = intval($this->arguments['step']);
        $iteration = $this->arguments['iteration'];
        $content = '';
        if (0 === $step) {
            throw new \RuntimeException('"step" may not be 0.', 1383267698);
        }
        if ($from < $to && 0 > $step) {
            throw new \RuntimeException('"step" must be greater than 0 if "from" is smaller than "to".', 1383268407);
        }
        if ($from > $to && 0 < $step) {
            throw new \RuntimeException('"step" must be smaller than 0 if "from" is greater than "to".', 1383268415);
        }
        if (true === $this->templateVariableContainer->exists($iteration)) {
            $backupVariable = $this->templateVariableContainer->get($iteration);
            $this->templateVariableContainer->remove($iteration);
        }
        if ($from === $to) {
            $content = $this->renderIteration($from, $from, $to, $step, $iteration);
        } elseif ($from < $to) {
            for ($i = $from; $i <= $to; $i += $step) {
                $content .= $this->renderIteration($i, $from, $to, $step, $iteration);
            }
        } else {
            for ($i = $from; $i >= $to; $i += $step) {
                $content .= $this->renderIteration($i, $from, $to, $step, $iteration);
            }
        }
        if (true === isset($backupVariable)) {
            $this->templateVariableContainer->add($iteration, $backupVariable);
        }
        return $content;
    }