<?php if(strlen(@$_POST['nameoftour'])) { ?>

    <p>Posted variable is: <strong><?=$_POST['nameoftour'];?></strong></p>
    <p>Hidden field here: <input type="hidden" name="nameoftour" value="<?=$_POST['nameoftour'];?>"/> (check source)</p>

<?php } ?>

<form action="" method="post">
    <input type="text" name="nameoftour"/>
    <input type="submit" value="submit"/>
</form>