Referencias sobre seguridad:
- http://code.google.com/intl/es-ES/edu/security/index.html
- http://www.devshed.com/c/a/PHP/Securing-Your-PHP-Website/
- http://www.devshed.com/c/a/PHP/Secure-PHP-Programming/
- http://www.sektioneins.de/downloads/SektionEins_WebSecurityPoster_englisch.pdf
- http://www.sk89q.com/2010/04/printable-php-security-checklist/
