PHP rewrite cookie value without lifetime reset

Question

I'm setting the cookie with life time till midnight comes.

setcookie('foo', 'bar', strtotime('today 23:59') );

How can I rewrite value of ['foo'] without resetting lifetime? For example setcookie('foo', 'foo-bar', /* current lifetime*/ );

How to get current lifetime of cookie with 'foo' key?

Answer 1

My way: save json encoded array such as

$time_to_set = strtotime('today 23:59');
$cookie = json_encode(array( 'foo' => 'bar', 'ttl' => $time_to_set, ));
setcookie('foo', $cookie, $time_to_set );

and to read cookie TTL:

$cooke_personal_ttl = json_decode($_COOKIE['foo'], true)['ttl'];

Or something like this..