[SOLVED]Case Sensitive in CP with local database

[_neok]

Hello everyone, I have searched without results a solution at the time.
I need convert the string "$user" to lowercase or uppercase independent of how users write it.
I use the captive portal service and this gives me error if the user field is misspelled in uppercase or lowercase.

I appreciate any help greatly.

[heper]

http://php.net/manual/en/function.strtolower.php

[jimp]

Use some javascript to change it in the HTML on submission, it won't require any changes to pfSense code, just the portal page you upload.