Web and PHP designer/editor freeware?

You can try to do one of the two things: find IDE dedicated to PHP, or some universal IDE which can work with PHP. This can be Microsoft Visual Studio, and in this case it has to be the PHP Visual Studio add-on.

Please see:
http://visualstudiogallery.msdn.microsoft.com/6eb51f05-ef01-4513-ac83-4c5f50c95fb5[^],
http://php4vs.codeplex.com/[^] (discontinued).

Some add-ons could be proprietary and commercial. You would to look at them by yourself: http://bit.ly/16NoNMt[^].

As to other IDEs, you could try PDT with Eclipse: http://www.eclipse.org/pdt/downloads/[^].

Another promising option would be Aptana Studio. Unfortunately, currently it only provides a PHP editor, but the debugger is said to be available soon, besides, reportedly, the debugging is already supported, via PDT or natively (please see the last link below), but I did not try it out. Please see:
http://www.aptana.com[^],
http://www.aptana.com/products/php/[^],
http://stackoverflow.com/questions/7102978/aptana-3-0-4-and-php-debugging[^].

That all was about using "standard" PHP for HTTP. However, I used to use much more exotic option: PHP for ASP.NET. The product I used is called Phalanger:
http://en.wikipedia.org/wiki/Phalanger_%28compiler%29[^],
http://www.php-compiler.net/[^].

It compiles PHP into CLI assemblies and thus can be used in ASP.NET solution the same way as ASP.NET pages are used. It has a good Visual Studio integration, So, besides, I used this product to develop in "standard" PHP, just to be able to use the PHP debugger. I used common subset of the language and PHP libraries, developed separate fragments/modules and later moved them to the site which isn't ASP.NET-enabled. At that time, I could not find other ways to debug PHP code.

But, if you are already using ASP.NET-enabled server and also develop in PHP, Phalanger might turn out to make a perfect tool for you.

—SA