Sublime Text is a very popular text editor in nowdays. Most of the developer chooes Sublime Test for codding because it is very smooth and pretty easy. I think specially most of the PHP developer are chooes sublime for developing. If you are working on ubunu system then you can install very easily, so just run bellow command for install Sublime Text 3 in Ubuntu.
sudo add-apt-repository ppa:webupd8team/sublime-text-3
sudo apt-get update
sudo apt-get install sublime-text-installer