ZEND PHP 5 Certification STUDY GUIDE

98 ” Web Programming
made for a PHP script—otherwise, the server can choose a different handler or, in
the case of static resources, such as images, output them directly).
Upon output, the server first writes a set of response headers to the clients; these
can contain information useful to the client—such as the type of content being returned,
or its encoding, as well as data needed to maintain the client and the server
in a stateful exchange (we’ll explain this later).
i
Forms and URLs
Most often, your script will interact with their clients using one of two HTTP methods:
GET and POST. From a technical perspective, the main difference between these
two methods is in the fact that the latter allows the client to send along a data payload,
while the former only allows you to send data as part of the query string.
This, of course, doesn’t mean that you can’t submit a form using GET—only that
you will be somewhat limited in the size and type of data that you can send. For
example, you can only upload files using POST, and almost all browsers implement
limitations on the length of the query string that confine the amount of data you can
send out with a GET operation.
Contrary to popular belief, POST is not an inherently more secure way to submit forms
than GET. We explain this concept in greater detail in the Security chapter.
From an HTML perspective, the difference between GET and POST is limited to
the action attribute of the element:
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Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)