How do I view a PHP file's design in Dreamweaver consistently?

[LABachlr]

When I first view the PHP file in dreamweaver, it's fine. Then when I change some coding, sometimes it's fine, and sometimes just the header shows. However, when I upload it to the server and view it, it's fine. How do I get it so that I can always view the design of it offline within Dreamweaver?

(there is not much PHP coding on the page; it's mainly HTML)

[Sekka]

Some PHP code may be required to display some HTML.

Dreamweaver has a built in HTML engine, not server engine, so will just see the PHP code and won't be able to preview it.