PHP nested IF statement... maybe something else would be better?

I need to add into the code below an IF statement (in the commented area), checking that the order number and a few other things are greater than 0... if they aren't, I need to return a message to the browser saying "no good" or whatever. If they are, then the code keeps going. The code below is tested and it worked, but now I just need that break in the middle that checks for data validation before inserting into the db and sending the email.

    public function indexAction()
    {

       $request_result = array('success' => false);
       if($this->get('security.context')->isGranted('ROLE_USER')) {
          $em = $this->getDoctrine()->getEntityManager();
          $dbAzure = new DbAzure();
          $user = $this->container->get('security.context')->getToken()->getUser();
          $request = $this->getRequest();
          
          $om_customer_id = $user->getCustomer()->getOmCustomerId();
          $order_number = $request->get('order_number');
          $qm_sku = intval($request->get('qm_sku'));
          $options = $request->get('options');
          $qty = intval($request->get('qty'));
          $email = $request->get('email');
          
          
          // Verify data is correct.. order_number > 0....om_customer_id > 0.. qm_sku > 0... qty > 0
          // if not value... don't write the info and return an error

          
          $request_result['success'] = $dbAzure->submitReturnRequest($order_number, $qm_sku, $options, $qty);
          
          $fullname = $user->getFirstName()." ".$user->getLastName();
          $subject = "Return Request for OM Order Number ".$order_number."";
          
          
          $message = \Swift_Message::newInstance()
                 ->setSubject($subject)
                 ->setFrom(array($email => $fullname))
                 ->setTo(array("me@me.com"))
                 ->setContentType( 'text/html' )
                    ->setBody(
                        $this->renderView(
                            'MyAccountBundle:ReturnRequest:emailRequestProductReturn.html.twig',
                            array('fullname' => $fullname,
                            	  'om_customer_id' => $om_customer_id,
                            	  'qm_sku' => $qm_sku,
                            	  'email' => $email)
                        )
                    );
          $this->get('mailer')->send($message);
       }

       $code = ($request_result['success'])?200:500;
       return new JsonResponse( $request_result, $code );
    }

}

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