src/web/Request.php
public function delete_cookie($name) {
        // Remove the cookie
        unset($_COOKIE[$name]);

        // Nullify the cookie and make it expire
        return setcookie($name, null, -86400, $this->cookie_path, $this->cookie_domain, $this->cookie_secure, $this->cookie_httponly);
    }
public function delete_cookie($name) {
        // Remove the cookie
        unset($_COOKIE[$name]);

        // Nullify the cookie and make it expire
        return setcookie($name, null, -86400, $this->cookie_path, $this->cookie_domain, $this->cookie_secure, $this->cookie_httponly);
    }
Deletes a cookie by making the value null and expiring it.

Cookie::delete('theme');

@param   string $name cookie name
@return  boolean