RingCentral MMS Example Request in PHP

rc_mms_example_request.php

$request = $rcsdk->createMultipartBuilder()
                 ->setBody(array(
                     'from' => array('phoneNumber' => $smsNumber),
                     'to'   => array(
                         array('phoneNumber' => $credentials['mobileNumber']),
                     ),
                 ))
                 ->add(fopen('https://developers.ringcentral.com/assets/images/ico_case_crm.png', 'r'))
                 ->request('/account/~/extension/~/sms');

$response = $platform->sendRequest($request);