如何使用php获取url中的元标记

Question

我写了这样的代码：

$ch = curl_init();
curl_setopt($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');

此代码目前正在运行，但有些URL会阻止PHP脚本以防止抓取。如何解决这个问题？

Answer 1

添加user_agent它将起作用

 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');

Answer 2

您可以使用以下方式提取所有元标记：

$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