php抓取这个页面的内容,该如何解决

include 'simple_html_dom.php';
$opts = array( 
  'http'=>array( 
    'user_agent' => $_SERVER['HTTP_USER_AGENT']
  ) 
); 
$context = stream_context_create($opts); 
$url = 'http://www.mafengwo.cn/yj/10206/2-0-1.html';
 
$html = file_get_html($url, false, $context);
$div = $html->find('div.post-list ul');
foreach($div[0]->find('li') as $i=>$item) {
  echo $item->find('img')[0]->src, PHP_EOL;
  echo trim($item->find('h2')[0]->text()), PHP_EOL;
  echo trim($item->find('div')[3]->text()), PHP_EOL;
  //echo '**', $item->innertext(), PHP_EOL;
}