In Chapter 15 we saw how Ajax can enhance your user's experience by making asynchronous requests for information. In that chapter we focused entirely on client-side Ajax. In this chapter we'll focus on using Ajax to communicate with programs on webservers, which I will also call server-side programs.

This chapter explains:

  • What server-side programs can do for you

  • Different types of requests

  • The basics of PHP, a server-side programming language

  • How to use PHP to read and save files on webservers

  • What to do if the webserver you are contacting doesn't respond

  • How to update the contents of a web browser automatically when a server-side file changes

Real-World Examples of Server-Side Ajax

Almost all examples of Ajax on the Web involve ...

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