<form method="GET" action="cake.php" id="form2">
  <button type="submit" form="form2">Cheese Cake</button>
</form>

<?php

require_once 'connect.php';

if (isset($_GET['form2'])) {

$query = $db->query("
    SELECT iname, qty FROM contain, ingredient
    WHERE cakeid IN ( SELECT cakeid FROM cake WHERE cakename = 'Cheese Cake')
    AND contain.ingredid = ingredient.ingredid
    ");
    ?>

<?php
if (mysql_num_rows($query) != 0) {
    while ($r = $query->mysql_fetch_array()) {
            ?>
        <div class="result">
            <h3>HELLO</h3>
        <h4><?php echo $r->iname; ?></h4>
        </div>

        <?php

    }
}
}