Zend FR

public function getViewHelperConfig()
    {
        return array(
            'factories' => array(
                'pieddepage' => function ($sm) {
                        $locator = $sm->getServiceLocator();
                        return new Pieddepage($locator->get('Site\Model\ArticlesTable'));
                    },
            ),
        );
    }

<?php
namespace Application\View\Helper;

use Zend\View\Helper\AbstractHelper;

class Pieddepage extends AbstractHelper
{

    protected $_postsTable;

    public function __construct($postsTable)
    {
        $this->_postsTable = $postsTable;
        return $this;
    }

    public function __invoke()
    {
        $posts = $this->_postsTable->fetchAll();
        return $this->getView()->render('application/view/pieddepage.phtml', array(
            'pieddepage' => $posts
        ));
    }

}

?>

<?php
                    echo $this->pieddepage();
                    ?>

Fatal error: Class 'Application\View\Helper\Pieddepage' not found in /Users/paulborel/Sites/dependanceseniors/module/Application/Module.php on line 105