Second that.
If you need a Text Editor recommendation try
TextWrangler from the makers of BBEdit. It's a great free code editor without all of BBEdit's bells-and-whistles.
Set yourself up a PHP server on your local machine (If you can't compile your own, use a
Binary installer instead.) Then put some pages in your ~/Sites folder and view them in Safari at http:///~
username/ (Where
username is your OS X Short Username.)
It doesn't get any simpler than that. If you need a WYSIWYG editor for PHP you should probably quit while you're ahead.