How to Delete All Cookies Upon User Logout in PHP?

Unsetting All Cookies Upon User Logout in PHP

In web development, it may be necessary to delete all cookies associated with a user upon logout. For example, you may have used setcookie("user", false); to delete cookies in the past, but this approach often falls short. This article explores a reliable solution for deleting all cookies for a specific domain using PHP.

To accomplish this, PHP provides the unsetcookie() function. Unlike setcookie("user", false);, which only sets the value of the specified cookie to false, unsetcookie() deletes the specified cookie altogether.

To unset all cookies for a domain, you can use the following code:

<code class="php">if (isset($_SERVER['HTTP_COOKIE'])) {
    $cookies = explode(';', $_SERVER['HTTP_COOKIE']);
    foreach($cookies as $cookie) {
        $parts = explode('=', $cookie);
        $name = trim($parts[0]);
        setcookie($name, '', time()-1000);
        setcookie($name, '', time()-1000, '/');
    }
}</code>

By iterating through the $_SERVER['HTTP_COOKIE'] string and calling unsetcookie() on each cookie name, this code effectively removes all cookies from the browser. The time()-1000 argument ensures the cookies expire immediately, and the leading and trailing slashes in the path parameter guarantee the deletion of all occurrences of the cookie throughout the domain.

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