如何使用php在url中获取元标记

我编写了如下代码：

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$data = curl_exec($ch);
curl_close($ch);
$html = $data;

//parsing begins here:
$doc = new \DOMDocument();
@$doc->loadHTML($html);
$metas = $doc->getElementsByTagName('meta');

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此代码目前正在运行，但一些URL会阻止PHP脚本，以防止刮取。如何解决此问题？

添加用户代理它将正常工作

 curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13');

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您可以使用以下方法提取所有元标记：

$tags = get_meta_tags('http://www.example.com/');

// Notice how the keys are all lowercase now, and
// how . was replaced by _ in the key.
echo $tags['author'];       // name
echo $tags['keywords'];     // php documentation
echo $tags['description'];  // a php manual
echo $tags['geo_position']; // 49.33;-86.59

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做个好人，不去破坏那些不想让你这么做的网站，怎么样，