PHP programming is not a very difficult task, but we can sometimes choose some help so that it's more beautiful.
GPHPDTD is a free open source application for GNU / Linux that allows you to easily create and edit PHP files. It's much easier than using one of the general text editors.
The app has some useful functions. For example, when you create suggestions while writing, the parameters required for each coding function will remind you when typing the code. Similarly, the app provides you a browser, which you can use to search the database where all your files are stored for specific types and PHP functions.
Although the main use of the program is to edit the PHP code, gPHPEdit is able to recognize other types of files, such as HTML, CSS or even SQL, for example.