Nowadays every website authenticating a user using some of the greatest trusty third party websites like Google, yahoo or some of the social networks. Today we are learning how to authenticate a user using his Yahoo account. By using third party login we make user feel happy by avoiding filling a registration form. So just start with a simple illustration.

Using facebook registration plug-in users can easily sign up on your website using facebook data. With one simple facebook login the form will be filled with user appropriate data. This plug-in is a simple iframe you can place it anywhere on your webpage. You can also add a custom field if facebook doesn’t have.

In this tutorial I want explain how to create a Captcha in PHP. We are using some of the features available in PHP for creating an image. This is very simple and basic tutorial and we are not using any custom fonts for generating captcha image. And we know that captcha code used to avoid spam/abuse or auto-submission.