I think the only thing here to say is you shouldn’t use Yii with a PHP version that is not supported. PHP 6.0 is a dev version and as such it is not included in the requirements of PHP 5.1.0 or higher.
Btw… all those messages you got are about PHP directives… if you don’t know what they do, it would be good to study them a bit for current PHP versions…
Maybe you have to know that PHP6 is dead , the development was stopped .
So use the last php 5.3 or 5.4 version and last stable MySQL , avoid using alpha or dev version while using frameworks , use them only for you own experimentations.