There ARE so called CMS (WYSIWYG content management systems) which are remotely hosted and php/mySQL based. Mostly they are developed individually and priced respectively (at least middle x,xxx).
exactly what he said. Php is a server side lanuage. Basically designed to do some behind the scene calculations and then output to the html code. Using front page or dreamweaver to do your layout is fine you can then resave the file as .php and add some php code inside. Though personally I dont use FP or Dreamweaver, I use a very cool program called PSPad it's not a WYSIWYG editor but the best code editor around, and free.