ExistsViewHelper.php

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

class ExistsViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($file) {
        $result = FALSE;
        if (file_exists($file) && is_file($file)) {
            $result = TRUE;
        }
        return $result;
    }
}