title: PHP header 404 not working
body: <p>Why is this not working, as in the pre-set 404 page is not loaded:</p>
  
  <pre><code>header("HTTP/1.0 404 Not Found");
  exit;
  </code></pre>
  
  <p><code>.htaccess</code> has the <code>ErrorDocument 404 /404.html</code> directive set.
  <br/><br/>Thank you.</p>