$primary = $this->dbmapper->category['primary'] ;  // ( Correct Output )

但是,当将对象名称放在名为$dataname的变量中时,它返回空白,如：

$dataname = 'category';
 $primary = $this->dbmapper->$dataname['primary'] ;   ( Blank Output )

我的构造函数变量是

$this->dbmapper = $this->mapper();

我的功能是：

function mapper($module='')
    {
        $mapper =  array();
        $mapper['category']['table'] = 'allcategory';
        $mapper['category']['primary'] = 'categoryID';
        $mapper['page']['table'] = 'allpages';
        $mapper['page']['primary'] = 'pageID';
        return (object) $mapper;
    }