php frameworks like Zend framework for building browser based mmo games

I am planning to write a browser based strategy game similar to Travian but a totally different idea.
I am familiar with php and object-oriented programming in php.
I am going to use php/mysql/javascript.

Recently, I have heard people use frameworks such as Zend framework to build dynamic websites.
I looked at Zend Frameworks documentation and it was pretty good. They follow model-view-controller style.

I was wondering if you guys recommend, using framework to build these type of browser based games?

Assumptions: {

Assume that I know how to handle server side (Load balancer/application/database) across multiple servers)
Assume that I have the ability spend money on server side and handle any kind of traffic.

}