PHP/Utility Function/output add rewrite var

URL Rewriting

 
<?
    <?php
      output_add_rewrite_var("foo", "baz");
      echo "<a href="mypage.php">Click here!</A><br />";
      output_add_rewrite_var("bar", "baz");
      echo "<a href="mypage.php">Click here!</A><br />";
      echo "<form action="mypage.php" method="post">";
      echo "<input type="button" value="  Click here!  " />";
      echo "</form>";
    ?>
    <a href="mypage.php">Click here!</a>
?>