When you are handling so many projects and those projects are saved in different repository locations, you may find it very difficult to keep track all the versions and revisions manually and it will be much harder if you are developing in multiple repository branches.
It can happen that you work in development environment and you make changes to database tables structures, adding tables, or changing fields.
Does your application need to know user's details on browser details, os and device type? We can use PHP's misc. function to achieve that provided you have an update copy of browsercap.ini