On Tue, 2009-07-14 at 11:59 +0530, Girish Padia wrote: > Dear Sir, > > I am facing two problem while developing my site in php. > 1) I want to delete browser history whenever i migrate from one page to > another. so that user can never press "Back" button. > 2) I have 20 users who have access to my site. Right now I am checking this > using cookies. I want to know which is better to track user login : Cookies > or Session ? > > Please do reply. > > With regards, > > Girish
You can't delete the users browser history, but what you can do is use an entirely AJAX based website, so that there is no back/forward option. However, this may be a little complex for you unless you have at least a fair understanding of HTML Dom, and Javascript. To understand which is betterm you need to understand how they work. Cookies are persistent text files left on the users computer. They are limited in the amount of data you can store in them, but they can store information across physical browsing sessions. For example, you could use them to remember a users preferred layout for your site, etc. Sessions variables are all stored on your server, and generally last only for the time that a visitor is on your site. They are referenced automatically by PHP through a session ID, which is usually stored in a cookie, but you can force it to be sent only in the URL if you wish. The advantage that sessions have over cookies is the ability to store more data, and as it is server-side, you can store things without worrying too much about that data being accessed by someone other than your user. Cookies have the advantage of persistence over time (depending on how long you prefer to store them). You should not that some users see cookies as invasive, and may have them turned off in the browser. I'd say if you can do something server or client-side, you're better off doing it where you have the greatest control, a la server-side. Thanks Ash www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
