»  The first thing to be considered is to know who will be using and/or modifying your applications. In case there are many people using the application, it may be best use a popular PHP framework that the developers are familiar with.
»  Moreover, if one wishes to build web applications for personal needs, choose the framework you are comfortable with.
»  Also, it is important to consider factors like – ease of use, rapid development/performance, popularity amongst developers, features, and support/forums. »  Before starting you work, do try out several PHP frameworks to know which best suits your requirements.
»  There are pros and cons of all frameworks. For instance, Zend Framework has been around since V3 and is full of features plus has an extensive support system in place since it has been around for so long. On the contrary, Cakephp is another PHP framework which is younger than Zend Framework and has slightly less of a support system in place. However this framework is growing rapidly and is much more user-friendly and easy to use.
»  Every PHP framework has its own pluses and minuses, so use the trial and error method to find out which one to use. Ask your colleagues and partners which one to use.