PHP allows you to set up a session and store session variables. After you create a session, the session variables are available for your use on any other Web page. To make session information available, PHP does the following:
A cookie is a small bit of information stored on a viewer's computer by his or her web browser by request from a web page. The information is constantly passed in HTTP headers between the browser and web server; the browser sends the current cookie as part of its request to the server and the server sends updates to the data back to the user as part of its response.
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