Euro sign shows as € when form is submitted

[eluser]boltsabre[/eluser]
Sounds like an encoding issue, using UTF-8 isn't the problem, it's making sure you use it EVERYWHERE (same can be said about any charset).

What is your database collation? What is your meta charset? Are you escaping your data? If so how? Is it ajax? Sending data from Ajax to PHP can also cause issues, you need to uft8_decode($your string) it.