php is a server side programming lanuage. It is used mainly when the page needs to do something internally before displaying the results on the screen, in example, verify (if this is a protected page) that the user is logged in, or retrieve data from the database and display them, or perform some kind of calculations, etc. In other words, whenever is required a dynamic behaviour from the page.

Html is static, it only displays whatever has been designed.

PHP pages always contain some hrml code which is responsible for the visual output.

As a good rule, publishing your pages right from the start as php will allow you to eventually add code in them, if required, without having to change them in the furure from html to pho. Thus you preserve your SE ranking and your menus.

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