Not that php 6 is coming out next week but that framework would fail with it because of it dependence on get_magic_quotes_gpc() which may or may not be an easy fix but i would think a newer framework would follow most common standards and since magic quotes are a bad idea(which is why it is finally being removed in php 6) and no one has ever said that magic quotes are great as long as i has been doing PHP programming(2 years) so who knows what other weird stuff that framework does. I would love to ask the lead developer why he/she decided to support magic quotes.
From where did you learn that Yii depends on get_magic_quotes_gpc()?
On the contrary, Yii tries to eliminate the effect of get_magic_quotes_gpc() if magic quotes is enabled.