PHP Schleife

<?php
echo "<h3>SESSION</h3>";
echo "<table border=1 width=50%>";
echo "<tr bgcolor=\"#3399FF\">";
echo "<td><b><font color=\"#FFFFFF\">Variable Name</font></b></td>";
echo "<td><b><font color=\"#FFFFFF\">Value</font></b></td></tr>";
while(list($key, $val) = each($_SESSION))
{
   echo "<tr><td>$key</td><td><b>$val</b></td></tr>";
}
echo "</table>";
?>