Using AJAX to execute PHP code

Using AJAX to execute PHP code

I'm not entirely familiar with the MVC model and I cannot get my head
around it, however I am trying to simplify things by having my page design
separate from my logic. I have my basic template all set up, and I would
like hyperlinks to open PHP files within the same page.
For instance:
Next Page
rather than opening nextpage.php, I would like the contents of
nextpage.php to open the code into a div on the same page. The contents of
nextpage.php will contain some PHP code, and some HTML forms
I'm assuming AJAX is the right approach to this, but any suggestions is
greatly appreciated.
Thanks