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

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.

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.

Since Yii 1.0.5 you can use named scopes with ActiveRecords. They are a great help in simplifying your query calls.

Lets say we have two models and relation between them:

This is a simple demo how to use Zend_AMF with Yii.

Info: This tutorial references the idea presented in Jonah's excellent blog article.

Set your messages in a controller:

Sometimes you need to force a user to change their password after x number of days. This article describes how to implement this using a filter, ChangePasswordFilter.

When you define or extend a class, you can create class variables and methods in Yii just like you can in any other PHP system: