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Method: channels.checkUsername

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Check if a username is free and can be assigned to a channel/supergroup


channelUsername, chat ID, Update, Message or InputChannelThe channel/supergroup that will assigned the specified usernameOptional
usernamestringThe username to checkOptional

Return type: Bool

Can bots use this method: NO

MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('', 'madeline.php');
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');

$Bool = $MadelineProto->channels->checkUsername(channel: $InputChannel, username: 'string', );