php – T_PAAMAYIM_NEKUDOTAYIM覆盖CButtonColumn后出错

Parse error: Syntax error,unexpected T_PAAMAYIM_NEKUDOTAYIM in /home/xxx/public_html/protected/components/GridView/XCButtonColumn.PHP on line 65

我读到了什么意思是“T_PAAMAYIM_NEKUDOTAYIM”,它的意思是“::”
link here
,但我不明白我能做些什么来解决问题.

第65行：

if (is_array($modelClass::model()->primaryKey))

这是我的代码：

<?PHP
class XCButtonColumn extends CButtonColumn
{
    public $htmlOptions = array('class' => 'center vcenter');
    public $viewButtonOptions = array('class' => 'btn btn-default tip view');
    public $viewButtonImageUrl = '';
    public $viewButtonHtml;
    public $updateButtonOptions = array('class' => 'btn btn-default tip update');
    public $updateButtonImageUrl = '';
    public $updateButtonHtml;
    public $deleteButtonOptions = array('class' => 'btn btn-default tip delete');
    public $deleteButtonImageUrl = '';
    public $deleteButtonHtml;
    public $showImage = false;
    public $showHtml = true;

    protected function renderButton($id,$button,$row,$data)
    {
        if (isset($button['visible']) && !$this->evaluateExpression($button['visible'],array('row' => $row,'data' => $data))) return;
        $label = isset($button['label']) ? $button['label'] : $id;
        $url = isset($button['url']) ? $this->evaluateExpression($button['url'],array('data' => $data,'row' => $row)) : '#';
        $options = isset($button['options']) ? $button['options'] : array();
        if (!isset($options['title'])) $options['title'] = $label;
        if ($this->showImage) {
            if (isset($button['imageUrl']) && is_string($button['imageUrl'])) {
                echo CHtml::link(CHtml::image($button['imageUrl'],$label),$url,$options);
            } else {
                echo CHtml::link($label,$options);
            }
        } else {
            if (isset($button['html']) && is_string($button['html'])) {
                echo CHtml::link($button['html'],$options);
            } else {
                echo CHtml::link($button['html'],$options);
            }
        }
    }

    protected function initDefaultButtons()
    {
        if ($this->viewButtonLabel === null) $this->viewButtonLabel = Yii::t('zii','View');
        if ($this->updateButtonLabel === null)
            $this->updateButtonLabel = Yii::t('zii','Update');
        if ($this->deleteButtonLabel === null)
            $this->deleteButtonLabel = Yii::t('zii','Delete');
        if ($this->viewButtonImageUrl === null)
            $this->viewButtonImageUrl = $this->grid->baseScriptUrl .
                '/view.png';
        if ($this->updateButtonImageUrl === null)
            $this->updateButtonImageUrl = $this->grid->baseScriptUrl
                . '/update.png';
        if ($this->deleteButtonImageUrl === null)
            $this->deleteButtonImageUrl = $this->grid->baseScriptUrl
                . '/delete.png';
        if ($this->viewButtonHtml === null)
            $this->viewButtonHtml = '<i class="icon-zoom-in iconwhite"></i>';
        if ($this->updateButtonHtml === null)
            $this->updateButtonHtml = '<i class="icon-edit iconwhite"></i>';
        if ($this->deleteButtonHtml === null)
            $this->deleteButtonHtml = '<i class="icon-trash iconwhite"></i>';
        if ($this->deleteConfirmation === null)
            $this->deleteConfirmation = Yii::t('zii','Are you sure you want to delete this item?');
        $modelClass = $this->grid->dataProvider->modelClass;
        $controller = strtolower($modelClass);
        if (is_array($modelClass::model()->primaryKey))
            $paramExpression = '",$data->primaryKey)';
        else
            $paramExpression = '",array("id"=>$data->primaryKey))';
        foreach (array('view','update','delete') as $id) {
            $button = array(
                'label' => $this->{$id . 'ButtonLabel'},'url' => 'Yii::app()->urlManager->createUrl("' . "$controller/$id$paramExpression",'imageUrl' => $this->{$id . 'ButtonImageUrl'},'html' => $this->{$id . 'ButtonHtml'},'options' => $this->{$id . 'ButtonOptions'},);
            if (isset($this->buttons[$id]))
                $this->buttons[$id] = array_merge($button,$this->buttons[$id]);
            else
                $this->buttons[$id] = $button;
        }
        if (!isset($this->buttons['delete']['click'])) {
            if (is_string($this->deleteConfirmation))
                $confirmation = "if(!confirm(" .
                    CJavaScript::encode($this->deleteConfirmation) . ")) return false;";
            else
                $confirmation = '';
            if (Yii::app()->request->enableCsrfValidation) {
                $csrfTokenName = Yii::app()->request->csrfTokenName;
                $csrfToken = Yii::app()->request->csrfToken;
                $csrf = "\n\t\tdata:{ '$csrfTokenName':'$csrfToken'
},";
            } else
                $csrf = '';
            if ($this->afterDelete === null)
                $this->afterDelete = 'function(){}';
            $this->buttons['delete']['click'] = <<<EOD
function() {
$confirmation
var th = this,afterDelete = $this->afterDelete;
jQuery('#{$this->grid->id}').yiiGridView('update',{
type: 'POST',url: jQuery(this).attr('href'),$csrf
success: function(data) {
jQuery('#{$this->grid->id}').yiiGridView('update');
afterDelete(th,true,data);
},error: function(XHR) {
return afterDelete(th,false,XHR);
}
});
return false;
}
EOD;
        }
    }
}

提前致谢