Untitled

<?php
$doc = new DOMDocument();
$doc->load( 'things.xml' );
$things = $doc->getElementsByTagName( "thing" );
?>

<html>
<body>

<h1>List of things</h1>

<ul>
  <?php foreach( $things as $thing ){ ?>
    <li>
    <?php echo $thing->nodeValue; ?>
    </li>
  <?php } ?>
</ul>

<form action="submit.php" method="post">
New thing: <input type="text" name="thing" />
<input type="submit" value="Create" name="create"/><br>
<input type="submit" value="Clear things" name="clear"/>
</form>

</body>
</html>