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Method: channels.deleteTopicHistory

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Delete message history of a forum topic

Parameters:

NameTypeDescriptionRequired
channelUsername, chat ID, Update, Message or InputChannelForumOptional
top_msg_idintTopic IDOptional

Return type: messages.AffectedHistory

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();

$messages_AffectedHistory = $MadelineProto->channels->deleteTopicHistory(channel: $InputChannel, top_msg_id: $int, );