"This document describes how to customize the session
handlers in PHP4. We will provide examples of how to write a fully
functional session handler that works with DBM files and one that
works with a MySQL database."
"New to PHP4 was a set of native session handling functions
which was badly missing from PHP3. By default, each session is
stored as a separate file in your temporary directory (eg. /tmp in
Unix). This may or may not be appropriate depending on your
requirements. For example, if you have a bunch of web/PHP servers
on different machines, you can't easily share sessions between them
(well you could save the sessions on an NFS share but that would be
slow). Another problem is that you potentially have thousands or
even millions of session files cluttering up your file system (you
run a big site right )."
"Fortunately for us, the developers of PHP4 were forward
thinking enough (thanks!) to provide the ability for users like you
and me to extend the session handling routines."
"This document is written to explain these session handlers a
bit and to provide two working examples of how you can extend the
session handlers. Our first example will be to make the session
handlers save session data into DBM files. Our second example will
have our sessions save into a MySQL database."
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