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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Deleting a cookie

Posted by admin (Graham Ellis), 19 February 2005
Q: How do I delete a cookie?

A: Set it with an expiry time in the past

There's an example on our web site at

Here's the source code of that page:

$year = 3600*24*365;
if (! is_string($_COOKIE[userkey])) {
       $received = "No cookie received - you are a NEW visitor";
       $newcomer = 1;
       $cval = uniqid("rn:");
       $say = "Your cookie called <b>userkey</b>".
               " will be set to $cval";
} else {
       $received = "Cookie received - you are a RETURNING visitor<br>".
               "Cookie value received - $_COOKIE[userkey]";
       $newcomer = 0;
       if ($_GET[logout]) {
               $newcomer = -1;
               $say = "Your cookie called <b>userkey</b>".
                       " has been deleted";
       } else {
               $say = "Your cookie called <b>userkey</b>".
                       " will NOT be altered";

<title>Setting and clearing a persistant cookie</title>
<body bgcolor="white">
<h2>Setting, reading and deleting a cookie</h2>
When you visit this page for the first time, you'll set a
cookie called <b>userkey</b> to a unique id starting with
"rn:".  The link below to "refresh" the page will visit the
page again, and the link to "logout" will visit the page
again, deleting the cookie.<br><hr><br>
<b>Current status:</b><br><br>
<?= $received ?><br><br><?= $say ?><br><hr><br>
<b>Actions available:</b><br><br>
You may <a href=<?=$PHP_SELF?>>reload this page</a><br>
<?php if ($newcomer != -1) { ?> You may
<a href="<?=$PHP_SELF?>?logout=1">log out</a><br><?php } ?>
You may <a href=/index.html>go to our home page</a><br><hr>
Example written by Graham Ellis of Well House Consultants<br>
We're in the business of training you on subjects like this!<br>
website: <a href=></a>

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