John De Goes (of N-Brain) let us know about a screencast he's posted on Vimeo of how he's set up the UNA Editor (Personal Edition - now free!) to work with PHP.

UNA Personal Edition includes full support for standard features of source code editors, such as syntax highlighting, auto-complete, regular expression search and replace, and external tool integration. [...] UNA Personal Edition allows developers to edit, compile, test, and execute files in any and all languages, and is a nice complement to heavyweight IDEs such as Eclipse and IntelliJ Idea.

The screencast lasts about five minutes and shows the creation of a new PHP project, how to set up a "launcher" to access the PHP online documentation right in the browser, use the built-in syntax checker PHP has (lint) and execute the current file.