CycleViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class CycleViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper
{
    protected $values = null;

    protected $currentCycleIndex = null;

    public function render($values, $as)
    {
        if ($values === null) {
            return $this->renderChildren();
        }
        if ($this->values === null) {
            $this->initializeValues($values);
        }
        if ($this->currentCycleIndex === null || $this->currentCycleIndex >= count($this->values)) {
            $this->currentCycleIndex = 0;
        }

        $currentValue = isset($this->values[$this->currentCycleIndex]) ? $this->values[$this->currentCycleIndex] : null;
        $this->templateVariableContainer->add($as, $currentValue);
        $output = $this->renderChildren();
        $this->templateVariableContainer->remove($as);

        $this->currentCycleIndex ++;

        return $output;
    }

    protected function initializeValues($values)
    {
        if (is_object($values)) {
            if (!$values instanceof \Traversable) {
                throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('CycleViewHelper only supports arrays and objects implementing \Traversable interface', 1248728394);
            }
            $this->values = iterator_to_array($values, false);
        } else {
            $this->values = array_values($values);
        }
        $this->currentCycleIndex = 0;
    }
}