What should I pay attention to if I have 2 Yii webapp?

I’m going to host a second site using Yii 1.1.8. Will the application level cache of the two conflict? And what else should I pay attention to?

No.

As the guide says:

http://www.yiiframework.com/doc/guide/1.1/en/caching.data

It’s quite easy to have multiple yii applications on a server.

You can share the single framework installation among them.

Thanks a lot softark, I remember you have helped me several times here :)