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setcookie("namecookie", "Jaynes PHP site has registered a cookie here", time()+3600);
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Ensure cookies come before any HTML. If your cookies aren't being set, one very common problem seems to be that something is being sent to the browser before the cookie.
http://en.wikipedia.org/wiki/HTTP_cookie
In computing, a cookie (also tracking cookie, browser cookie, and HTTP cookie) is a small piece of text stored on a user's computer by a web browser. A cookie consists of one or more name-value pairs containing bits of information such as user preferences, shopping cart contents, the identifier for a server-based session, or other data used by websites.
It is sent as an HTTP header by a web server to a web browser and then sent back unchanged by the browser each time it accesses that server. A cookie can be used for authenticating, session tracking (state maintenance), and remembering specific information about users, such as site preferences or the contents of their electronic shopping carts. The term "cookie" is derived from "magic cookie", a well-known concept in UNIX computing which inspired both the idea and the name of browser cookies. Some alternatives to cookies exist; each has its own uses, advantages, and drawbacks.
Being simple pieces of text, cookies are not executable. They are neither spyware or viruses, although cookies from certain sites are detected by many anti-spyware products because they can allow users to be tracked when they visit various sites.
Most modern browsers allow users to decide whether to accept cookies, and the time frame to keep them, but rejecting cookies makes some websites unusable. For example, shopping carts or login systems implemented using cookies do not work if cookies are disabled.
The term "cookie" derives from "magic cookie", which is a packet of data a program receives and sends out again unchanged.
During normal operation cookies are sent back and forth between a server (or a group of servers in the same domain) and the computer of the browsing user. Since cookies may contain sensitive information (user name, a token used for authentication, etc.), their values should not be accessible to other computers. Cookie theft is the act of intercepting cookies by an unauthorized party. Cookies can be stolen via packet sniffing in an attack called session hijacking. Traffic on a network can be intercepted and read by computers on the network other than its sender and its receiver (particularly on unencrypted public Wi-Fi networks). This traffic includes cookies sent on ordinary unencrypted http sessions. Where network traffic is not encrypted, malicious users can therefore read the communications of other users on the network, including their cookies, using programs called packet sniffers.
http://php.about.com/od/advancedphp/qt/php_cookie.htm
The main difference between a cookie and a session is that a cookie is stored on your computer, and a session is not. Although cookies have been around for many years and most people do have them enabled, there are some who do not. Cookies can also be removed by the user at any time, so don't use them to store anything too important.