Cookies
Cookies are small strings of data created by a Web server but stored on the client. In addition to having names and values, cookies have an expiration time. Some are set to last for only a matter of minutes. Others persist for months. This allows sites to recognize you without requiring a password when you return. To learn more about cookies, you may wish to visit Netscape's site <http://developer.netscape.com/docs/manuals/communicator/jsguide4/cookies.htm>.
Using cookies with PHP is almost as easy as using form fields. Any cookies passed from the browser to the server are converted automatically into variables. In addition, cookies are stored in the HTTP_COOKIE_VARS array.
If you wish to send a cookie, you use the setcookie function, ...
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