无法捕获sql连接异常 [ 2.0 版本 ]

PHP Warning – yii\base\ErrorException

mysql_connect(): Access denied for user 'r'@'localhost' (using password: YES)
1. at line 29
20212223242526272829303132333435363738     * @inheritdoc
     */
 
    public function actionIndex()
    {	
 
        $model=new EntryForm();
    	if ($model->load(Yii::$app->request->post()) && $model->validate()) {
    		try{
    		$conn=mysql_connect('localhost',$model->user,$model->psw);
    		}catch(Exception $e){echo $e;}