public function block($file, $data = [])
    {
        $block              = clone($this);
        $block->layout_file = null;
        return $block->doRender($file, $data);
    }
public function block($file, $data = [])
    {
        $block              = clone($this);
        $block->layout_file = null;
        return $block->doRender($file, $data);
    }
public function block ( $ file , $ data = [ ] ) { $ block = clone ( $ this ) ; $ block -> layout_file = null ; return $ block -> doRender ( $ file , $ data ) ; }
render a block, without default layout.

@param string $file
@param array  $data
@return string
render a block without default layout .