SortAlphabeticalViewHelper.php

<?php

namespace GeorgRinger\News\ViewHelpers\Format;

use TYPO3\CMS\Extbase\Persistence\ObjectStorage;

/**
 * This file is part of the "news" Extension for TYPO3 CMS.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 */
class SortAlphabeticalViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper
{
    /**
     * @var bool
     */
    protected $escapeOutput = false;


    /**
     * Initialize arguments.
     */
    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('items', 'mixed', 'items', true);
        $this->registerArgument('as', 'string', 'as', true);
    }


    /**
     * Render children but do nothing else
     *
     */
    public function render()
    {
        $as = $this->arguments['as'];


        $items = $this->arguments['items'];

        if ($items instanceof ObjectStorage) {
            $items = $items->toArray();
        } elseif (!is_array($items)) {
            $items = [];
            // todo error
        }
        usort($items, function ($a, $b) {
            return mb_strtolower($a->getTitle()) > mb_strtolower($b->getTitle());
        });

        $this->templateVariableContainer->add($as, $items);
        $output = $this->renderChildren();
        $this->templateVariableContainer->remove($as);
        return $output;
    }
}