Cookies (1/3) Send information between 2 visits

Sometime, after a first visit on a site you may have the feeling that this site recognizes you when re-visiting it… This is true! because a file (you are not aware of) is stored on your hard drive... But, let's explore this issue…

Unless you have already deactivate this possibility in the parameters of your browser, you must have a folder totally full up on your hard drive … C:\WINDOWS\Cookies Full of small .txt files; each one containing information that was written by a site during your last visit (or session). This information will be read during your next visit to the same site so that the site will be able to recognize you...

A cookie includes information such as:

its name: requirement!

some content: if empty, the cookie is removed!

an expiration date: if not the cookie will not survive after the session!

How to do it?

Read a cookie by using the Cookies function of the Request object: <% if Request.Cookies("email")<>"" then%>    Unsubscribe <%else%>    Subscribe <%end if%> Write a cookie by using the Cookies method of Response object: <% Response.Cookies("email")="info@truc.com" Response.Cookies("email").Expires = Date+365 ' 1 year ! %> Delete a cookie, by emptying it: <% Response.Cookies("email")="" Response.Cookies("email").Expires = Date-1 %> Delete all cookies : <% cookies = Request.ServerVariables("HTTP_COOKIE") for each nom in cookies    Response.Cookies(nom)="" next %>

Read a cookie PHP creates automatically a variable : <? if($email) { ?>    Unsubscribe <? } else { ?>    Subscribe <? } ?> If NOT : <? $email = $_COOKIE["email"]; if($email) { ?>    Unsubscribe <? } else { ?>    Subscribe <? } ?> $_COOKIE or $HTTP_COOKIE_VARS or nothing? Write a cookie by using the setcookie() function: <? $duration = 365*24*60*60; // 1 year in seconds! setcookie("email","info@truc.com",time()+$duration); ?> Delete a cookie, by emptying it: <? setcookie("email"); ?> Delete all cookies : <? while(list($nom,$val)=each($HTTP_COOKIE_VARS))    setcookie($nom); ?>

Attention: There is no HTML code or posted instruction
before a cookie write code!!!