title: How to avoid xss atack in php codeigniter
body: <p>I am relatively new to web development. And just today my teacher told me to implement a method to avoid cross server scripting in my project. I have searched a lot and found about <code>xss_clean</code> but i am not sure how to use and implement it. Any guide or article related to that would be welcome. Or if you want to explain here that would save me a lot of extra hard work i will be very thankful to you. I am using <code>CodeIgniter</code> framework so please any article related to that would be good.</p>