如何在zf2中获取表id

我在ZF2中创建了一个视图文件。在该文件中，我将id传递给控制器。

如何在控制器中获取此id？

这是我想要获取id的showAction代码：

public function showAction()
{           
    $id = (int) $this->params()->fromRoute('id', 0);
    if (!$id) {
        return $this->redirect()->toRoute('calendar', array(
            'action' => 'create'
        ));
    }               
}

这是我的index.phtml，我在上面传递id来显示控制器：

<table class="table">
<tr>
    <th>Calendar name</th>
    <th>Description</th>
    <th>Actions</th>
</tr>
<?php foreach ($calendars as $key => $value) :  ?>
<tr>
    <td>
        <a href="<?php echo $this->url('calendar',array('action'=>'show', 'id' => $this->escapeHtml($value['_id'])));?>">
                <?php echo $this->escapeHtml($value['title']);?>
        </a>
    </td>
    <td><?php echo $this->escapeHtml($value['description']);?></td>
    <td>
        <a href="<?php echo $this->url('calendar',
            array('action'=>'settings', 'id' => $this->escapeHtml($value['_id'])));?>">Settings</a>
        <a href="<?php echo $this->url('calendar',
            array('action'=>'delete', 'id' => $this->escapeHtml($value['_id'])));?>">delete</a>
    </td>
</tr>
<?php endforeach; ?>
</table>