<form method="POST"> <?php if (isset($_POST["cancella"])) { ?> <input type="number" name="input1" value="" /> <input type="number" name="input2" value="" /> <?php } else { ?> <input type="number" name="input1" value="<?php $num1->stampN(); ?> " /> <input type="number" name="input2" value="<?php $num2->stampN(); ?> " /> <?php } ?> <br /> <br />