Editing PHP files can be done with any text editing program, like Windows’ built in NotePad editor or one of a number of free, open-source options.
Our webmaster uses Sublime Text, a sophisticated text editor with capabilities like editing very large files, displaying syntax errors in real time, and search whole projects quickly. Worth checking out if you spend a lot of time editing programs or text documents.
Sublime Text can be downloaded and used for free. They request that a license be purchased for continued use, but there is no enforced time limit for the evaluation.