|内容||You can use both.|
I am just done a project with a solution that intergate wordpress and yii.
Yii for particular functions (booking, product manage,..)
and Wordpress for all others general CMS (news, static page) and SEO.
Because building SEO and CMS with Yii is almost like creating from zero
and WP not good at manage business object with many custom fields or complex related data. Force wp do complex business is very stressfully and messy.