PHP built in function to determine if email is valid [duplicate]

Question

Possible Duplicate:
How to validate an Email in PHP?

Does PHP have a built in function for determining if an email address is formatted properly. I know it can't go out and check if the email is actually active; I'm talking about just confirming that an email address is structurally correct.

Answer 1

filter_var can do this:

$result = filter_var( '[email protected]', FILTER_VALIDATE_EMAIL );

It returns false when it failed validation, and returns the e-mail address otherwise.