if ($this->request->isPost()) {
            $assets = $this->params()->fromFiles('fsFB');
            $postArr = $this->getRequest()->getPost()->toArray();
            $formData = array_merge(
                    $postArr, //POST
                    array('file' => $assets) //FILE...
            );
            $form->setData($formData);
            if ($form->isValid()) {

                $adapter = new \Zend\File\Transfer\Adapter\Http();
//                $size = new \Zend\Validator\File\Size(array('min' => 1)); // minimum bytes filesize, max too..
                $extension = new \Zend\Validator\File\Extension(new \Zend\Validator\File\Extension('png,jpg,gif,jpeg'));
                $adapter->setValidators(array($extension), $assets);
                /**
                 * Valid Upload
                 */
                if ($adapter->isValid()) {
                    die(true);
                } else {
                    die("false1");
                }