yii highcharts

$tadates=Target::model()->findAll(
                              array(
                              'select'=>'date, achived',
                              'condition'=>'user_id="'.$model->user_id.'"'
                             )); 
$xAxis=array();
$yAxis=array();
foreach($tadates as $tadate):
$xAxis[]=date("M, Y",strtotime($tadate->date));
$targetvalue[] = 100*1;
$yAxis[]=$tadate->achived*1;
endforeach;

 $this->Widget('ext.highcharts.HighchartsWidget',
        array(
            'options'=> array(
   'credits' => array('enabled' => false),
     
                'exporting' => array(
                    'enabled' => true,
                ),
    
   'title' => array(
                    'text' => 'Target',
                ), 
    
                'xAxis' => array(
                    'title' => array(
                        'text' => 'Year',
                    ),   
                    'categories' => $xAxis,
                ),
                'yAxis' => array(
                    'title' => array(
                        'text' => 'Target',
      
                    ),     
                ),
                'series' => array(
                    array(
                        'name'   => 'Target chart',
                        'data'   => $yAxis,
                       'shadow' => false,
      'type' => 'column',
      
                    ),
     
     array(
                        'name'   => 'Target Value',
                        'data'   => $targetvalue,
      'color'=> '#8bbc21',
                      'shadow' => false,
      'type' => 'column',
      
                    )
     
                )
            )
        )
    );