drupal7在page中直接输出区块

//正规方法：
$block = block_load('block', '1');// block_load($module, $delta) block.module 行 714
$output = drupal_render(_block_get_renderable_array(_block_render_blocks(array($block))));
print $output;
//分开写是这样的：
$block = block_load($module, $block_id);
$block_content = _block_render_blocks(array($block));
$build = _block_get_renderable_array($block_content);
$block_rendered = drupal_render($build);

 简单暴力的获取区块的输出内容如下,我在page里想通过上面的方法输出我自定义区块，结果报错Notice: Only variables should be passed by reference，研究一番，就用了下面的方法：

   $module='obcustom';
    $delta='thinkers_bottom_end';
    $block = block_load($module, $delta);
    $block_content = _block_render_blocks(array($block));
    $key=$module.'_'.$delta;
    if(!empty($block_content[$key]->content['#markup'])){
      print $block_content[$key]->content['#markup'];
    }