title: Setting cookie path to "/" does not make cookie accessible to entire site
body: <p>Why when set php cookie path to "/" doesn't work for every subdirs in the domain, but just for the current directory.</p>
  
  <p>cookie is set like:</p>
  
  <pre><code>setcookie("name", "val", expire_time, "/");
  </code></pre>
  
  <p>It just doesn't want to work.</p>