yii2如何传递参数到layout布局文件中：
1、布局中访问数据：
在布局中可访问两个预定义变量：$this 和 $content， 前者对应和普通视图类似的yii\base\View 视图组件 后者包含调用yii\base\Controller::render()方法渲染内容视图的结果。
yii2如何传递参数到layout布局文件中
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