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So what we are trying to do is stop people from seeing pages unless they are logged in. We also don’t want any people going directly to the url to see the page either.

So you are using cookies on your website, but when a visitor visits www.yourdomain.com and yourdomain.com the cookie doesn’t get set across both! That is because in essence, www. is simply a subdomain. The “www” component is not a protocol, it is not necessary, instead all it is, is just a marketing ploy.

Are you at the stage where your website needs to pass information from one page to another? If so then you might want to learn about PHP Sessions.

This tutorial will help you understand:
What is a session.
How use session in a PHP script.
A session test with 3 scripts.
How session ID can be managed without cookies.
Where is session data stored.

A tutorial on the basics of sessions in PHP.

Code snippet for creating a unique randome ID for cookie management.

According to the cookie specification, any cookie set for one domain, must not be sent to any other domain. Therefore, if you set a cookie in your user's browser on one domain, that cookie will not be available on any other domain. This tutorial describes a solution to get around this issue.

Learn how to log users out of a system after x amount of minutes of inactivity. This is a great security add-on!

Cookies are text files stored on the client computer and they are kept of use tracking purpose. Learn how to use cookies with PHP

Sessions can store user information, heres how to use them

Sessions are basically cookies with a fallback, they end when you close you're browser.

It's perhaps common knowledge these days as to what a cookie is. A cookie sits client-side in a user's browser and is sent to the server when the page is loaded. Cookies, however, can go a little deeper than just setting and receiving.

A very basic easy to follow tutorial on creating a login system using sessions with a MySQL database.

Basics of MySQL and showing the contents of a database table.

basics of sessions is described, and two examples are used to ilustrate it: Showing number of times we have visit a page during a session, and password protection using sessions.

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