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Yii does not have an LDAP class itself, but its very easy to implement LDAP in the stock UserIdentity class.

This wiki describes a more complex workflow using the XUpload widget

An application component is a confortable way for share information among all component of the application

You have a multilingual application, and you want the URL of a page to be different for different languages, to account for SEO. The URL for the contact page for example should look like http://something.com/en/contact in english, and http://something.com/de/contact in german. This tutorial describes how to make it happen. Note that currently selected language is always a part of the URL, and thus available to the application through $_GET. You don't have to use sessions variables to keep track of the language if you don't want to.

CHtml::ajaxLink(), CHtml::ajaxSubmitButton() and similar methods are great, but if they are located inside a portion of the page that is already loaded via ajax something bad will happen, something you may even not notice if you are not using tools like firebugs: the sent ajax requests will multiply themselves.

I needed British (dd/mm/yyyy) formatted dates throughout my application but found it very difficult to find examples of how to do this - until I found this excellent forum post http://www.yiiframework.com/forum/index.php?/topic/3649-dealing-with-i18n-date-formats/

I have a CGridView with a list of clients/events. For each row (EventClient) I wanted a quick edit dialog.

If we want to set meta tags on a per page (controller-action) basis, we may use the clientScript application component.

A simple and effective way to keep track what your users are doing within your application is to log their activities related to database modifications. You can log whenever a record was inserted, changed or deleted, and also when and by which user this was done. For a CActiveRecord Model you could use a behavior for this purpose. This way you will be able to add log functionality to ActiveRecords very easily.

I've seen many tickets regarding how to show friendly delete confirmation using CGridView's CButtonColumn in ajax request. If you are using relational database, after producing CRUD functionality when you try to delete a record in ajax mode which has child record it can't be deleted and you can see the ajax loader forever. By this way you can't show the users if a record has been successfully deleted or if there are some problem in flash style (setFlash() / getFlash())