Пара полезных ссылок

http://www.eschrade.com/page/generating-secure-cross-site-request-forgery-tokens-csrf/
https://github.com/codeguy/Upload
https://github.com/KnpLabs/Gaufrette
https://github.com/ircmaxell/filterus
https://github.com/Respect/Validation
https://github.com/mikeemoo/ColorJizz-PHP