title: how to delete all cookies of my website in php
body: <p>I'm wondering if I can delete all my website's cookies when a user click on logout, because I used this as function to delete cookies but it isn't work properly:</p>
  
  <pre><code>setcookie("user",false);
  </code></pre>
  
  <p>Is there a way to delete one domain's cookies in PHP?</p>