Well it's not caused by the script I gave you, it's caused by one of the plugins you have installed.
Go to your AdminCP > Plugins & Products > Plugin Manager and find a hook which makes use of "login_verify_failure_username". A plugin which makes use of that hook is causing it.

Okay, that works. Is there a way to make usernames match this regular expression: ^[^\s]+$
And disallow all symbols?

Thank you,

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Oh also, I just banned an account and checked if it would be banned on the game server and its still returning a 1, and not a 2. Any ideas?

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Any ideas?

Hello. So, this file is for authenticating from a website to a gameserver. Now the issue is that people are able to put spaces after their account name and basically I would like to know if there is anothing anyone might be able to do with this code to prevent that from happening.

Thank you,

You can prevent embedded spaces, however I find that trailing spaces are automatically trimmed on my local dev site.

To see the options for username restrictions, follow:

AdminCP -> Settings -> Options -> User Registration Options -> Username Regular Expression

Okay, what would you put there to disable embedded spaces after the username?

I don't know offhand of regex that will only trim/leading trailing spaces. :)

I've done some research and the only thing that Username expressions eliminates is the ability to create new accounts with trailing spaces. What I want to do is eliminate that ability to login to pre-existing accounts with trailing spaces as well.

Please advise,

Yes, leading/trailing spaces are trimmed automatically upon registration. I have no idea how users were able to register with trailing spaces.

You will likely have to manually edit the offending usernames, and send the users an email to advise them of the change to their username.

This is the really weird thing. So, there are no spaces in anyone's username, and yet, they are still able to login when using a space in their name. Like let's say your account name is johndoe16, you can login just fine if your type in "johndoe16 " And this is the case for infinite spaces.

Please advise,

Yes, you can type in trailing spaces when you log in, but those spaces do not change the actual username in the database.