In this mini howto I would like to show how to add a required captcha field in the login form, after a defined number of unsuccessfull attempts.
To do this, I will use the blog demo that you have in default Yii download package (path/to/yii/demos/blog).
Had to implement PayPal payments for a client and would like to share part of my code with you. Because the tutorial will become too long, I'll leave some code to be done by you, e.g. creating models, controllers and db tables for products, orders.