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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).

This solution requires Yii 1.1.9 or above

In case of a multilingual application, one might consider it a reasonable approach to store the preferred language of the user in a session variable, and after that, every time a page is requested, to check this session variable and render the page in the indicated language. This tutorial shows a Yii-way of doing this. We implement an event handler for the onBeginRequest event; as the name of the event suggests, this event handler will be called at the beginning of each request, so its a good place to check whether a language is provided (via post, session or cookie) and set the application language accordingly. We also implement a simple Language-Selector Widget, which can render the language options as ajax-links or as a drop-down list.

First of all, You must change component config to enable the default Yii CSRF validation.

This had me stumped for a while so I figured it would be nice to share here to avoid others the grief.