Yii is the only framework I’ve worked with. However, when applying to almost all job vacancies in my area they ask me to use any other framework but Yii, especially Zend, Symfony or Laravel. I’d like to stick with Yii and not to have to learn other frameworks. And not because I dislike them, but because I don’t want to overload my head. So, should I learn new frameworks to get more job opportunities or not?