title: trouble with cookies
body: <p>I have a folder test in my localhost.
  In file test/cookie/a.php:</p>
  
  <pre><code> &lt;?php setcookie('email','abc@gmail.com',time()+3600);?&gt;
  </code></pre>
  
  <p>In file test/cookie/b.php</p>
  
  <pre><code>&lt;?php echo $_COOKIE['email'] ?&gt;
  </code></pre>
  
  <p>A file name test/x.php, I write code</p>
  
  <pre><code>&lt;?php
  echo $_COOKIE['email'];
  ?&gt;
  </code></pre>
  
  <p>first, I run file a.php, after that I run b.php, and x.php. But only file a.php display abc@gmail.com, file x.php show error:</p>
  
  <p>Notice: Undefined index: email in D:\xampp\htdocs\test\x.php on line 2.</p>
  
  <p>Any idea? </p>