GroupedForViewHelper.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 GroupedForViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper
{
    public function render($each, $as, $groupBy, $groupKey = 'groupKey')
    {
        $output = '';
        if ($each === null) {
            return '';
        }
        if (is_object($each)) {
            if (!$each instanceof \Traversable) {
                throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('GroupedForViewHelper only supports arrays and objects implementing \Traversable interface', 1253108907);
            }
            $each = iterator_to_array($each);
        }

        $groups = $this->groupElements($each, $groupBy);

        foreach ($groups['values'] as $currentGroupIndex => $group) {
            $this->templateVariableContainer->add($groupKey, $groups['keys'][$currentGroupIndex]);
            $this->templateVariableContainer->add($as, $group);
            $output .= $this->renderChildren();
            $this->templateVariableContainer->remove($groupKey);
            $this->templateVariableContainer->remove($as);
        }
        return $output;
    }

    protected function groupElements(array $elements, $groupBy)
    {
        $groups = ['keys' => [], 'values' => []];
        foreach ($elements as $key => $value) {
            if (is_array($value)) {
                $currentGroupIndex = isset($value[$groupBy]) ? $value[$groupBy] : null;
            } elseif (is_object($value)) {
                $currentGroupIndex = \TYPO3\CMS\Extbase\Reflection\ObjectAccess::getPropertyPath($value, $groupBy);
            } else {
                throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('GroupedForViewHelper only supports multi-dimensional arrays and objects', 1253120365);
            }
            $currentGroupKeyValue = $currentGroupIndex;
            if (is_object($currentGroupIndex)) {
                if ($currentGroupIndex instanceof \TYPO3\CMS\Extbase\Persistence\Generic\LazyLoadingProxy) {
                    $currentGroupIndex = $currentGroupIndex->_loadRealInstance();
                }
                $currentGroupIndex = spl_object_hash($currentGroupIndex);
            }
            $groups['keys'][$currentGroupIndex] = $currentGroupKeyValue;
            $groups['values'][$currentGroupIndex][$key] = $value;
        }
        return $groups;
    }
}