CountViewHelper.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 CountViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $escapingInterceptorEnabled = FALSE;

    public function render($subject = NULL) {
        if ($subject === NULL) {
            $subject = $this->renderChildren();
        }
        if (is_object($subject) && !$subject instanceof \Countable) {
            throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('CountViewHelper only supports arrays and objects implementing \Countable interface. Given: "' . get_class($subject) . '"', 1279808078);
        }
        return count($subject);
    }
}