Is there a definitive anti-XSS library for PHP?

Question

I already know how XSS works, but finding out all the many different ways to inject malicious input is not an option.

I saw a couple libraries out there, but most of

Answer 1

OWASP offers an encoding library, on which time has been spent to handle the various cases.

Obsolete: http://www.owasp.org/index.php/Category:OWASP_Encoding_Project

Now at http://code.google.com/p/reform/
and OWASP's antiXSS specific library is at: http://code.google.com/p/php-antixss/