MadelineProto/docs/API_docs/methods/channels_checkUsername.md

title	description
channels.checkUsername	channels.checkUsername parameters, return type and example

Method: channels.checkUsername

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Parameters:

Name	Type	Required
channel	InputChannel	Yes
username	string	Yes

Return type: Bool

Example:

$MadelineProto = new \danog\MadelineProto\API();
if (isset($token)) { // Login as a bot
    $this->bot_login($token);
}
if (isset($number)) { // Login as a user
    $sentCode = $MadelineProto->phone_login($number);
    echo 'Enter the code you received: ';
    $code = '';
    for ($x = 0; $x < $sentCode['type']['length']; $x++) {
        $code .= fgetc(STDIN);
    }
    $MadelineProto->complete_phone_login($code);
}

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

Or, if you're into Lua:

Bool = channels.checkUsername({channel=InputChannel, username=string, })