Not able to clear cookie what ever I do using PHP

Question

I have tried a few ways to clear my cookies on localhost. Whatever I do, I am unable to delete them in Chrome and Firefox in normal mode, but it is working fine in Chrome's Incognito and Firefox's Private Browsing modes.

Here is my code:

$name = 'keepsignin';

if (isset($_SERVER['HTTP_COOKIE'])){
   $cookies = explode(';', $_SERVER['HTTP_COOKIE']);
   foreach ($cookies as $cookie_id => $cookie_value){
       if($cookie_id === $name){
          self::set_cookie($cookie_id, $value, $expiry, $path, $domain);
       }
   }
}

After clearing the cookie manually things work fine, but I am not able to delete cookies that already exist.

Answer 1

$_SERVER['HTTP_COOKIE'] is a semi-colon delimited list of key-value pairs in the form:

key1=value1;key2=value2;key3=value3;...

You split the string at the ;, but not the =

I think you might be looking for something like:

$name = 'keepsignin';

if (isset($_SERVER['HTTP_COOKIE'])) {
   $cookies = explode(';', $_SERVER['HTTP_COOKIE']);
   foreach ($cookies as $cookie) {
       list($cookie_id, $cookie_value) = explode('=', $cookie);
       if($cookie_id === $name){
          self::set_cookie($cookie_id, $value, $expiry, $path, $domain);
       }
   }
}

Note the use of list() to assign $cookie_id and $cookie_value in one operation.

Answer 2

I would recommend iterating the $_COOKIE superglobal rather than parsing $_SERVER['HTTP_COOKIE'] yourself.