Classes/ViewHelpers/SectionViewHelper.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 SectionViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper implements \TYPO3\CMS\Fluid\Core\ViewHelper\Facets\PostParseInterface, \TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface
{
    public function initializeArguments()
    {
        $this->registerArgument('name', 'string', 'Name of the section', true);
    }

    public static function postParseEvent(\TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode $syntaxTreeNode, array $viewHelperArguments, \TYPO3\CMS\Fluid\Core\ViewHelper\TemplateVariableContainer $variableContainer)
    {
        $sectionName = $viewHelperArguments['name']->getText();
        if (!$variableContainer->exists('sections')) {
            $variableContainer->add('sections', array());
        }
        $sections = $variableContainer->get('sections');
        $sections[$sectionName] = $syntaxTreeNode;
        $variableContainer->remove('sections');
        $variableContainer->add('sections', $sections);
    }

    public function render()
    {
        if ($this->viewHelperVariableContainer->exists(\TYPO3\CMS\Fluid\ViewHelpers\SectionViewHelper::class, 'isCurrentlyRenderingSection')) {
            $this->viewHelperVariableContainer->remove(\TYPO3\CMS\Fluid\ViewHelpers\SectionViewHelper::class, 'isCurrentlyRenderingSection');
            return $this->renderChildren();
        }
        return '';
    }

    public function compile($argumentsVariableName, $renderChildrenClosureVariableName, &$initializationPhpCode, \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\AbstractNode $syntaxTreeNode, \TYPO3\CMS\Fluid\Core\Compiler\TemplateCompiler $templateCompiler)
    {
        return '\'\'';
    }
}