Handler Implementations
The best way to arrange the functions that implement the session handlers is to place them in a single support file. By placing the functions shown in Example D-2 through Example D-9 in the one file, you can include that file at the beginning of any PHP script using sessions. The support file containing the handler implementations-for example mysql_sessions.inc-must be included before any session calls are made as shown in the following example:
<?php
include("mysql_sessions.inc");
start_session( );
//... rest of script ...
?>