I am developing an application, magazine store for PC and I have completed most of the work for pc, but the client also want to have the same thing in other android devices (loa
I don't think it has anything to see with Zend Framework/PHP (according to your question tags). Your question is more relative to Javascript/CSS.
I recommend you this awesome article: Different Stylesheets for Differently Sized Browser Windows on CSS-Tricks. You can also take this website as a reference, their technique is really the best way to do it to me, but it requires a lot of work (and time) too.