无法获取 og:image php

Question

我正在使用此脚本从网站获取 og:image 标签：

function getFrontImage($url){
  $page_content = file_get_contents($url);

  $dom_obj = new DOMDocument();
  $dom_obj->loadHTML($page_content);
  $meta_val = null;

  foreach($dom_obj->getElementsByTagName('meta') as $meta) {

    if($meta->getAttribute('property')=='og:image'){ 

        $meta_val = $meta->getAttribute('content');
    }
  }

  return $meta_val;
}

然而，这似乎只适用于某些网页。例如，我可以从以下 link 中获取 og:image 标签：http://lietuvosdiena.lrytas.lt/aktualijos/2017/06/16/news/partnerystei-nepritare-konservatoriai-sulauke-liberalu-kircio-1702264/

但我无法从这个 link: http://sportas.lrytas.lt/krepsinis/2017/06/16/news/martynas-pocius-del-traumu-baigia-karjera-1703843/ 得到它，这很奇怪，因为它们在我理解的方面没有任何区别

Answer 1

我使用 curl 解决了我的问题。这是最终代码：

function getFrontImage($url){

libxml_use_internal_errors(true);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0');
curl_setopt($ch, CURLOPT_ENCODING , "gzip");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);


$page_content = curl_exec($ch); 

$dom_obj = new DOMDocument();
$dom_obj->loadHTML($page_content);
$meta_val = null;

foreach($dom_obj->getElementsByTagName('meta') as $meta) {

if($meta->getAttribute('property')=='og:image'){ 

    $meta_val = $meta->getAttribute('content');

}




}

return $meta_val;
}

无法获取 og:image php

can't get og:image php

php

meta-tags