you can't create an Ajax application in PHP. You can have an Ajax application served through a PHP process, but Ajax is 'Asynchronous Javascript And X(h)tml'.
Asking how you make one is like asking how you make an HTML page. Big question, and you only want one part of the answer.
Lookup: JavaScript, XMLHTTP requests in JavaScript, and the W3C XHTML DOM.
Moderator
Featured Poster
Reputation Points: 522
Solved Threads: 64
Veteran Poster
Offline 1,091 posts
since Jul 2006