ExistsViewHelper.php

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<?php
namespace TYPO3\CMS\Install\ViewHelpers\File;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;

class ExistsViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($file)
    {
        return static::renderStatic(
            [
                'file' => $file,
            ],
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $file = $arguments['file'];

        $result = false;
        if (file_exists($file) && is_file($file)) {
            $result = true;
        }
        return $result;
    }
}