How to Efficiently Delete All Cookies Associated with Your Website in PHP?

Deleting All Cookies Associated with Your Website in PHP

While attempting to erase all website cookies upon a user's logout, you encountered an issue with the following code:

<code class="php">setcookie("user",false);</code>

This code seems ineffective. Let's explore an alternative approach to purge cookies from a specific domain.

PHP's setcookie() Function

The PHP setcookie() function provides a means to both set and erase cookies. To delete a cookie, we can set its value to an empty string and set the expiration time to a past date:

<code class="php">setcookie("name", "", time() - 3600);</code>

Deleting All Cookies for a Domain

Implementing this approach to delete all cookies associated with a domain requires an alternative route. PHP's setcookie() function doesn't provide the ability to purge multiple cookies simultaneously. However, by leveraging the $_SERVER['HTTP_COOKIE'] variable, we can enumerate existing cookies and delete them individually:

<code class="php">// unset cookies
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 looping through the cookies and setting both path and expires values to empty strings, we can effectively obliterate all cookies associated with the current domain.

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