Yii - Highcharts - 无法显示Y值

Question

I'm using the Yii Highcharts extension, i can show X's values but cannot show the Y's values. My Highchart widget code is:

$user = Yii::app()->user->id ;
$xAxis =  Yii::app()->db->createCommand()
            ->select('data')
            ->from('teste')
            ->where('Utilizador_idUtilizador=:ut', array( ':ut'=>$user))    
            ->queryColumn();

$yAxis =  Yii::app()->db->createCommand()
            ->select('racio')
            ->from('teste')
            ->where('Utilizador_idUtilizador=:ut', array( ':ut'=>$user))    
            ->queryColumn();

$this->Widget('ext.highcharts.HighchartsWidget',array(
        'options' =>array(                         
            'title' => array('text' => 'Progressão'),
            'xAxis' => array(
                'categories' => $xAxis,                  
            ),
            'yAxis' => array(
                'title' => array('text' => 'valor'),                       
            ),
            'series' => array(
                array('name'   => 'Racio','data'   => $yAxis,'shadow' => false,
                )
            )
        )        
));


print_r($yAxis);

When i print_r($yAxis) it shows :

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 1 [5] => 0 [6] => 1 [7] => 1 )

if i use a static array: $yAxis = array(1,2,3,4,1,0,1,1); it works and When i print_r($yAxis) it shows : Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 1 [5] => 0 [6] => 1 [7] => 1 ) , its the same array ! why the dynamic array doesn't work ?

Can anyone help me ? Thank you for your time.