Apply what poster jedaisoul said. Designing pages in some Adobe platform is not the way to go unless you are probably going Flash, which means few people will be interested in your content (and you will have to tell them it is a flash-dependent site).
In general, you want to learn HTML markup for document structure, and CSS for document style.
PHP provides the ability to manipulate documents dynamically from the server side: for instance, you have a document template, and based on a user request (or response to a form), you can present a document in which you fill in the parts to a template customized for the user. PHP can also do a great deal more, and in fact, a very usual use of PHP is to allow you to interact with a database, as the need arises.
But only learn and use these tools when you are certain you need them. Figure out clearly what you want to do, and most likely you will be told what the right tool is for the job you want to do.