Ext.Ajax.request({
    url:'/zend/public/guestbook/sign',
    method: 'POST',
    params: {
        commented : arr2, datecreated : arr3
})

public function signAction() {

    if ($this->getRequest()->isPost()) {

        $commentdata = mysql_escape_string($_POST['commented']);
        $dcreatedata = mysql_escape_string($_POST['datecreated']);

        $formdata = array('comment' => $commentdata, 'date_created' => $dcreatedata);

        $model = new Application_Model_Guestbook($formdata);
        $mapper = new Application_Model_GuestbookMapper();
        $mapper->save($model);
        $msg = '{success:true, result:{message:'Data Saved!'}}';

    }
    else {
        http_response_code(404);
        $msg = '{success:false, errors:{reason:'Login failed, try again.'}}';
    }

}