test-session view helper TYPO3 Flow

<?php
namespace Company\Demo01\ViewHelpers;

use TYPO3\Flow\Annotations as Flow;

/**
* SessionViewHelper
*
* = Examples =
*
* <ff:bla />
*
* @Flow\Scope("prototype")
*/
class SessionViewHelper extends \TYPO3\Fluid\Core\ViewHelper\AbstractViewHelper {

    /**
    * print session id
    * @param string $bla test
    */

    public function render($bla) {
        $out = '0001';
        return $out;
    }
}

?>