Is Yii very different from Yii2?

Question

Yii

If it is very different, then how? Of course, it means ideologically, the concept as a whole, and the development logic on this framework. Thank you very much in advance.

Answer 1

Not strongly ideologically, but the code is incompatible.
Than - it is written in the documentation, and much better than it can be explained on the toaster.

Answer 2

I haven't looked at Yii2 yet, but according to first impressions, the "ideology, concept and development logic" is no different. What's different - uses Composer, built on namespaces (no more need for a global service locator), has REST, and as a result of all this - requires at least PHP 5.4.
Through Composer, you can generate 2 types of boilerplate applications - "basic" and "advanced". In the second, the client and administrative parts are immediately separated, and there is an admin panel out of the box.