Context is important for this question. So context first.
I learned Symfony 3 years back and did not used it. Now, it looks it is out from job market. I did not say I have learned much to use that knowledge later in life except that chained style of calling method on object. That I saw first time there ( $obj->test()->that()).
Now, I think I should learn Zend Framework as this is in demand. So, for job point of view it is good to learn it otherwise I do not see the use of it. It takes lots of time to learn a framework and in return it gives lots of command to remember. About MVC, I know MVC and I will learn much of it when I implement it myself. Here it is forced. Ok. good my app will be good because of MVC. But what else I will get just from learning it other than I will be prepared for Job market.
Can I learn something good from learning Framework for use in any projects (other than just able to work on Zend Framework) that can be helpful for a good programmer, tech person etc.? Where do I concentrate on Zend Framework to get advantage of its learning . How this can increase my real knowledge/php knowledge?
Zend Framework uses alot of concepts seen elsewhere. MVC, Front Controller Pattern, Registry Pattern, Two Step View, Adapter pattern to name a few. It’s also a component framework, which means you can (re)use elements of the framework in your projects (for example, using Zend_Cache in a project which does not use Zend Framework).