PHP AJAX chat and JSON Tutorial

Online chat solutions have been very popular long before AJAX was born. There are numerous reasons for this popularity, and you're probably familiar with them if you've ever used an Internet Relay Chat (IRC) client, or an Instant Messenger (IM) program, or a Java chat applet.

AJAX has pushed online chat solutions forward by making it easy to implement features that are causing trouble or are harder to implement with other technologies. First of all, an AJAX chat application inherits all the typical AJAX benefits, such as integration with existing browser features, and (if written well) cross-platform compatibility.

An additional advantage is that an AJAX chat application avoids the connectivity problems that are common with other technologies, because many firewalls block the communication ports they use. On the other hand, AJAX uses exclusively HTTP for communicating with the server.

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