Using PHP to Delete Cookies


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what is best php or html? (In: General Search Engine Optimization)

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Forum Index · Search Engine Forums · Building, Hosting and Maintaining Your Website · Coding & Databases - PHP, ASP, Perl, etc. · Using PHP to Delete Cookies - Not Working

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goldrush Joined: Aug 17, 2005 # Posts: 3	Posted: 2006-Jan-18 04:47 Hey Im making a shopping cart for a jewellery website and im having a bit of trouble with cookies. Oh and by the way im using php. Firstly ive got this code which creates the cookie with a generated id. Code: [copy] <?php $cartid = rand('1','9999999'); $cart = md5("".$cartid.""); if(isset($_COOKIE["cart"])) { return $_COOKIE["cart"]; } else { session_start(); setcookie("cart", $cart, time() + ((3600 * 24) * 30)); return session_id(); } ?> And then after the customer orders ive got this code which deletes the cookie so that the user wont have the same cart after theyve ordered. Code: [copy] <?php session_start(); setcookie("cart", "", time()-99999999); session_destroy(); ?> But even after theyve ordered and the code above has run, for some reason the user still has the same cookie with the same id. :pinch: Please if you see any errors in my code above or have any sugestions please reply! (Copy Shortcut)

dirty_shame Joined: Aug 28, 2005 # Posts: 191	Posted: 2006-Jan-18 07:08 You now have to include your domain name in cookies. Code: [copy] <pre> <? function get_unique_id($length=10, $pool=""){ if($pool == ""){ $pool = "ABCDEFGHJKLMNPQRSTUVWXY"; $pool .= "23456789"; } mt_srand ((double) microtime() * 1000000); $unique_id = ""; for ($index = 0; $index < $length; $index++){ $unique_id .= substr($pool, (mt_rand()%(strlen($pool))), 1); } return($unique_id); } /SET A COOKIE/ $cookieid = $HTTP_COOKIE_VARS['cookieid']; if(!isset($cookieid)){ $session = get_unique_id(); SetCookie("cookieid", "$session", time() + 14400, "/", ".YOURDOMAIN.com"); } /EXPIRE A COOKIE/ $cookieid = $HTTP_COOKIE_VARS['cookieid']; if(isset($cookieid)){ SetCookie("cookieid", "", time() - 14400, "/", ".YOURDOMAIN.com"); } ?> </pre> [ Message was edited by: JimBot 01/21/2006 12:18 pm ... Reason: Fixed Code Example. ] (Copy Shortcut)

dudibob Joined: Oct 13, 2005 # Posts: 1459	Posted: 2006-Jan-18 11:43 woah, looks complex (Copy Shortcut)

dirty_shame Joined: Aug 28, 2005 # Posts: 191	Posted: 2006-Jan-21 05:47 Nah. It's pretty straightforward. You don't have to use the get_unique_id function I quoted at the top. It's just the way I create 'em. No variables passed. The only important addition is the slash (to indicate the server domain default directory) and the domain name itself in the SetCookie function. Otherwise, most all modern browsers will reject a cookie (under even standard security settings) that does not declare in it's http header that it is being created from the same URL that the browser is currently viewing. (Copy Shortcut)

IanK Joined: Dec 07, 2003 # Posts: 90	Posted: 2006-Feb-04 09:36 Browsers reject cookies from domains outside of the one you are browsing. In PHP if you set a cookie without the domain specified every browser I've ever seen will accept it. As illustrated in this thread by the fact that the user is getting the cookie. That was never the problem The problem, apparently, is that the cookie is not getting deleted. Unfortunately as far as I can see the code is fine, it should be working. (Copy Shortcut)

dirty_shame Joined: Aug 28, 2005 # Posts: 191	Posted: 2006-Feb-05 00:42 Because, IanK, you can't delete a cookie with a Global session() call...It just deletes the PHP session on the server, not the cookie in the visitors browser. You have to basically "reset" the cookie to nothing and pre-date it to delete it on their end. Saying you've never failed to set a cookie WITHOUT specifying the domain is like saying you've never been stuck in the mud without ever having left the highway. At any rate, why risk losing a customer when it is such an incredibly easy thing to do anyway? [ Message was edited by: dirty_shame 02/04/2006 05:21 pm ] (Copy Shortcut)

iririr Joined: Aug 15, 2008 # Posts: 1	Posted: 2008-Aug-15 17:01 dirty_shame, thanks for your insistence on setting the domain in the cookie. My cookie was acting inconsistently across my site, and it was because no domain was being set. It's a real dirty shame that not even php.net encourages you to do that. (Copy Shortcut)

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