<form action="sell.php" method="post">
    <fieldset>
        <div class="form-group">
            Stock:
            <select name = "stock">
        // stocks is an array passed through render from the controler with the symbol of every stock
            <?php foreach($stocks as $stock):?>
                    <option value = <?= $stock ?>> </option>
        </div>
        <?php endforeach ?>
    </fieldset>
</form>