array('id' => CHtml::activeId($model, 'password')))); ?>This code generates an ID attribute of "Model_password" for a label element based on the "password" attribute of a model called "Model". The ID is also used as the "for" attribute of the label element, which ties it to an input field with the same ID. In both examples, the CHtml class is used as part of the Yii Framework, a popular PHP web application framework.