AJAX and PHP

Server-Side Techniques with PHP and MySQL
The web application will look like Figure 3.15:
Figure 3.15: Making Repetitive Asynchronous Requests
This repetitive task must start somewhere. In our application, everything starts with process().
There, we decide what kind of server request to make; we can either ask for a new random
number, or we can check for the buffer level of the random number generator server. We check for
the buffer level every 10 requests, and by default we don't ask for new random numbers unless the
buffer is higher than 50% . The process is described in the flowchart given opposite:
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