Laravel and Symfony are both good frameworks. Kahuna is an interesting one to look at and fairly simple (or was the last time I played with it, about 3 years ago).
Though, these are full-fledged frameworks and may "scare" new people away with information overload. This is of course depending on what type of person you are and how you learn. I would suggest looking at micro frameworks and working your way up, as they are more simplistic, not as large and you can scale them up to the full frameworks as you get more familiar with it.
Silex is the micro framework for Symfony, easy to get started on it and figure out what's going on.
Lumen is the micro framework for Laravel, also easy to get started on it and figure what's going on.
Slim is a micro framework for making APIs fast, it's pretty nice, if you're into making APIs I would check that out.
Keeping it simple and scaling up when it comes to learning can be a good way to learn, as then you understand more what each included package does as you install it as needed (i.e. scale up the micro framework with extra packages). Starting off the bat with a full framework, you may have to do a bit of research to find out what each package within the framework does, how it acts, etc. Especially in Laravel, which has crazy names for things that absolutely make no sense at all, half of the time. Again, that can be a great way to learn, but all depends on your learning style.
