<fieldset>
    <p>Choose an image then press "upload" </p><br>

    <form name="form2" enctype="multipart/form-data" method="post" action="upload.php" />
    <input class="form-control btn btn-primary" type="file" size="32" name="my_field" value="" /><br>

    <input type="hidden" name="action" value="image" />
    <input type="hidden" name="id" value="<?=$id?>" />
    <input type="hidden" name="path" value="students" />
    <input type="hidden" name="old_photo" value="<?=$student->photo?>" />

    <input class="form-control btn btn-danger" type="submit" name="Submit" value="upload" />
    </form>
</fieldset>

</form>