PHP friendly web software?

Can anyone recommend a wysiwyg web development software which is php friendly, i.e. you can design the page in wysiwyg and insert php code into the html without destroying the screen image preview. I've been using Frontpage to compose the page then dev-php to insert the php code. This has worked well but if layout changes need to be made Frontpage displays stuff all over the place. Just trying MS Expression but this shows blank page when any php code is present. Any ideas?