I have been using PHP Coder for about 7 years. I have used other PHP editors from time to time but always seem to drift back to PHP Coder. It isn't resource rich but it is very simple to use and makes writing PHP scripts a breaze.

PHP Coder allows you to run your code live on your test server. It runs the php script just as it would run in a browser.

You just configure PHP Coder telling it where your webserver is and where the PHP EXE or PHP server is and then the code will run with the push of a button.

This shows syntax highlighted code making it easy to spot variables, text, functions etc...

Click the download button to download PHP Coder.

You should also consider using one of the other heavy weights in IDE's like Eclipse or NetBeans for PHP. They are powerful and are packed with features.