56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
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---
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title: channels.checkUsername
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description: Check if this username is free and can be assigned to a channel/supergroup
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image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
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---
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# Method: channels.checkUsername
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[Back to methods index](index.md)
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Check if this username is free and can be assigned to a channel/supergroup
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### Parameters:
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| Name | Type | Description | Required |
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|----------|---------------|-------------|----------|
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|channel|[Username, chat ID, Update, Message or InputChannel](../types/InputChannel.md) | The channel/supergroup | Optional|
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|username|[string](../types/string.md) | The new username for this channel/supergroup | Yes|
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### Return type: [Bool](../types/Bool.md)
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### Can bots use this method: **NO**
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### MadelineProto Example:
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```php
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if (!file_exists('madeline.php')) {
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copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
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}
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define('MADELINE_BRANCH', '');
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include 'madeline.php';
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$MadelineProto = new \danog\MadelineProto\API('session.madeline');
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$MadelineProto->start();
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$Bool = $MadelineProto->channels->checkUsername(['channel' => InputChannel, 'username' => 'string', ]);
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```
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Or, if you're into Lua:
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```lua
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Bool = channels.checkUsername({channel=InputChannel, username='string', })
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```
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### Errors this method can return:
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| Error | Description |
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|----------|---------------|
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|CHANNEL_INVALID|The provided channel is invalid|
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|CHAT_ID_INVALID|The provided chat id is invalid|
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|USERNAME_INVALID|The provided username is not valid|
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