By Christopher Cosentino
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Extra resources for Advanced PHP for Web Professionals
A cookie can only hold one value, so storing cookies for each feature option quickly turns into a coding nightmare: When you have more than one or two features, you'd need a cookie for each one! This is where sessions can help. You can store multiple values that can be accessed across many pages. You keep the database queries to a minimum by loading the user preferences at the start of the session, and you only need to worry about storing one cookie on the user's browser, eliminating the worry of exceeding the finite number of cookies any one site can store on a browser.
Session_unregister() and session_unset() are independent of each other. However, do not call session_unregister() before session_unset() if you also want to unset the value of the variable you are unregistering. Unregistering the variable makes that variable untouchable by session_unset(), for it is no longer a session variable. The proper order to unset the variable $name, as well as unregister it, is: session_unset(); session_unregister("name"); You could also do the opposite if you wanted to make sure that a variable was registered and had a value: //If $name has not been registered with the session.
PHP supports link rewriting, which gets around the problems in using cookies to store session information. With link rewriting, PHP alters any links on your page so that they automatically include the $PHPSESSID variable. This does make the links look a little messy to the user, but in some cases it is the only way to be sure that you are accurately tracking a user's session. ini file so that sessions work correctly. ini file. ini will not work correctly under Windows. save_path = C:/temp You could also leave the value as /tmp and create a directory named "tmp" at the root of the drive on which your Web server resides.
Advanced PHP for Web Professionals by Christopher Cosentino