In this new post to his site Brandon Savage suggests that you don't learn any particular framework - learn PHP first, then move up from there.
Towards the end of my talk at phpDay in Verona, I was asked by two developers which framework I thought they should learn: Symfony or Laravel. I understand the pressure that developers feel like they’re under to learn a framework, and to somewhat “predict the future” by figuring out what is likely to be popular in PHP for the next few years. But my answer to them wasn’t what they expected. I told them that if they were new to PHP, that they should focus on learning PHP.
He notes that while frameworks can make it easier to get up and running more quickly, they can also make "tribes" if there's not a solid foundation in the language first. If the developer knows the language first, they can move into any framework and with limited effort pick it up and run with it. PHP frameworks come and go, and learning just one can limit you future when its popularity fades.