$dom = new DOMDocument();
@$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$keywords = $xpath->evaluate("/html/head/meta[@name='keywords']");
$content1 = $keywords->getAttribute('content');
报错的地方就在代码的最后一行
Fatal error: Uncaught Error: Call to undefined method DOMNodeList::getAttribute() in