versi view

<?php
    $result_a = $this->a_model->get_all();              //$query="select * from table_a";
    foreach($result_a as $row):
?>
    <ul>
        <li><?= $row->id_a?></li>
            <?php
//$queyr = "select * from table_b where id_a = $row->id_a";
            $result_b = $this->b_model->get_by($row->id_a, 'id');
 ?>
            <?php foreach($result_b as $row):?>
                <ul>
                    <li><?= $row->id_b ?></li>
                </ul>
            <?php endforeach ?>
    </ul>
<?php endforeach ?>