Method: channels.createForumTopic

Parameters:

Name	Type	Required
channel	Username, chat ID, Update, Message or InputChannel	Optional
title	string	Yes
icon_color	int	Optional
icon_emoji_id	long	Optional
send_as	Username, chat ID, Update, Message or InputPeer	Optional

Return type: Updates

Can bots use this method: YES

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();

// PHP 8+ syntax, use an array on PHP 7.
$Updates = $MadelineProto->channels->createForumTopic(channel: InputChannel, title: 'string', icon_color: int, icon_emoji_id: long, send_as: InputPeer, );