Method: channels.getGroupsForDiscussion
Get all groups that can be used as discussion groups.
Returned basic group chats must be first upgraded to supergroups before they can be set as a discussion group.
To set a returned supergroup as a discussion group, access to its old messages must be enabled using channels.togglePreHistoryHidden, first.
Return type: messages.Chats
Can bots use this method: NO
MadelineProto Example (now async for huge speed and parallelism!):
if (!file_exists('madeline.php')) {
copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';
$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();
$messages_Chats = $MadelineProto->channels->getGroupsForDiscussion();