PHP Studio is described as 'easy-to-use and comprehensive development solution for PHP based websites and applications' and is an app in the Development category. There are more than 100 alternatives to PHP Studio for a variety of platforms, including Windows, Mac, Linux, BSD and Online / Web-based. The best alternative is Visual Studio Code, which is free. Other great apps like PHP Studio are Notepad++ (Free, Open Source), Atom (Free, Open Source), Sublime Text (Free Personal) and Vim (Free, Open Source).
VS Code is more than just a code editor, it provides the tools and extensions to compile, debug, compare, refactor, and even manage code repositories all within a highly-customised development environment.
GNU nano is a small and friendly text editor. Besides basic text editing, nano offers many extra features like an interactive search and replace, go to line and column number, auto-indentation, feature toggles, internationalization support, and filename tab completion.