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ColdFusion
The <CFCOOKIE> tag is used to create cookies on the browser.
Existing cookies are accessed by simply adding "COOKIE." to the name
of the cookie, e.g. COOKIE.MyCookie1.
ASP
There are two cookies collections in ASP. You use the one in the Response
object to create and modify cookies and the one in the Request object to
get cookie information from the browser.
PHP
Use the setcookie() function to send a request to the browser to create
or update a cookie. This code must appear at the very start of the page.
Any content, even whitespace, preceding the opening PHP tag will generate
an error because that content will automatically be sent to the browser,
thus necessitating the header for the page to be sent. Later when you
want to send the cookie, which has to go with the header, PHP will find
that the header was already sent and generate an error informing you of
that fact. Note that if you have turned off error messages, this problem
could be hard to diagnose.
On startup of a script, cookies are automatically made available as
global variables referenced by the cookie name. For example, if there
is a cookie named username, then the variable $username would contain
the value of that cookie.
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