Security for social networking website [duplicate]

This question already has answers here: Closed 12 years ago.

Possible Du开发者_高级运维plicate:

What security issues should I look out for in PHP

How to protect my site(social networking) from being hacked?just suggest some methods that are in common?

i am using php for scripting & mysql for database and i am using CodeIgniter(php framework).

if you know some good tutorial or ebooks then provide me some link

-Abhijeet

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Here you go: http://www.phpfreaks.com/tutorial/php-security