question

Do you see the "/vendor/ringcentral/" folder under your project folder? Or check if that exists where you install SDK into.

Yes. I see vendor/ringcentral and all of the other files.

My script includes (variables below are defined)

require('vendor/autoload.php');

use RingCentral\SDK\SDK;

$rcsdk = new SDK($RINGCENTRAL_CLIENTID, $RINGCENTRAL_CLIENTSECRET, $RINGCENTRAL_SERVER);

and I actually echoed variables to the screen to make sure each file was included (as I executed from the Linux command line)... It does include SDK.php.

The error specified is on the line where it says "new SDK" ( figured I'd mention it).

Also... I noticed that the autoload_classmap.php file is basically empty. Unsure if this should be the case:

<?php
// autoload_classmap.php @generated by Composer
$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);
return array(
);

I saw this discussion as well. I did the below and it is bool(true).

I even echo debug output from SDK.php and it works... although, it doesn't see the class SDK when I do get_declared_classes().

<?php

require('vendor/autoload.php');

var_dump(file_exists("vendor/autoload.php"));