Function validateUsername

Checks a username obeys a load of rules

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs-Auth.php

Parameters summary
`integer`	`$memID`	The ID of the member
`string`	`$username`	The username to validate
`boolean`	`$return_error = false`	Whether to return errors
`boolean`	`$check_reserved_name = true`	Whether to check this against the list of reserved names

Return value summary
`array\|null`	Null if there are no errors, otherwise an array of errors if return_error is true

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Function validateUsername