使用PHP从Cookie删除值

Question

I am storing product id-s in a cookie with php. (These are the favorite products on a webshop.)

I added many products as favorit, so my cookie looks like: 12,55,120,43

What i know, that the $_COOKIE[$cookie_name] is not an array. (checked with is_array function)

How can i delete a product id from that cookie? I send the id that i want to delete with ajax to this php file:

    if(isset($_POST['id']))
{
    $id = intval($_POST['id']);

    $cookie_name = "kedvenc_termek";
    if(isset($_COOKIE[$cookie_name]))
    {
        echo $_COOKIE[$cookie_name];
    }

}

Answer 1

This should delete or invalidate cookie

// set the expiration date to one hour ago

setcookie($cookie_name, " ", time() - 3600);
?>

Answer 2

Unset your cookie:

unset($_COOKIE[$cookie_name]);

Set your cookie null:

setcookie($cookie_name, null, -1, '/');

Answer 3

If I understand you correct you have a string stored in the cookie like 12,55,120,43 and you want to remove one of them using $_POST['id'] ? Since it's a string I believe the best option is preg_replace() this gives you the benefit over str_replace that you can create a pattern to remove.

$id = $_POST['id'];
$cookie_name = "kedvenc_termek";
$_COOKIE[$cookie_name] = preg_replace("/\b(" . preg_quote($id) . ",)\b/", "", $_COOKIE[$cookie_name]);
echo $_COOKIE[$cookie_name];

If you want to store the new string in the cookie then be sure to do that before you echo the value since you can't set a cookie after an output.

Example: https://3v4l.org/RQH4o