unable to invite multiple users to private channel

[jeromezero]

awesome work! -
right now I am unable to get multiple slack users invited to a private channel.
perhaps I am not forming the user list correctly?
I've tried user names, user IDs, complete user links, everything I could think of. in quotes, comma separated. no luck.

now I am getting the following error in the server.php log:
[26-Sep-2016 16:04:32 America/Chicago] PHP Warning: Invalid argument supplied for foreach() in /server/php/server.php on line 69

line 69 calls the array of users to invite them:
foreach($invitedUsers as $user) { $chInvite = curl_init(SLACK_API_INVITE_URL); etc.

I am stuck!

(adding the default token user if no array is specified works great now, but I can't add others)

[jeromezero]

I am able to invite multiple users so far only by replacing a small bit of server.php:
$invitedUsers = isset($_POST['invitedUsers'])?json_decode($_POST['invitedUsers'], true):[];
with
$invitedUsers = ["U1xxxxxxx","U1xxxxxxx"]; - that is to say, by manually creating an array of user IDs (which can be found here: api.slack.com/methods/users.list/test)

so either I am simply not clear on the correct method by which to pass the user list, or there is a bug somewhere in between the gathering of the user list and the creation of the array at the top of server.php