What's the meaning of @var in php comments
<p>I see this (@var) in php comments a lot and have no clue what it means. Please tell.</p>

<pre><code>// example.php (taken from yii framework application code)

&lt;?php
/* @var $this CategoriesController */
/* @var $data Categories */
?&gt;

&lt;div class="view"&gt;

    &lt;b&gt;&lt;?php echo CHtml::encode($data-&gt;getAttributeLabel('idCategory')); ?&gt;:&lt;/b&gt;
    &lt;?php echo CHtml::link(CHtml::encode($data-&gt;idCategory), array('view', 'id'=&gt;$data-&gt;idCategory)); ?&gt;
    &lt;br /&gt;
&lt;/div&gt;
</code></pre>
