使用 xpath 获取元描述标签 [英] get meta description tag with xpath
本文介绍了使用 xpath 获取元描述标签的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要内容描述和关键字标签内容.我有这个代码，但不要写任何东西.想法?
I need the content the description and the keywords tag content. I have this code, but dont write anything. Idea?
$str = <<< EOD
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta name="description" content="text in the description tag" />
<meta name="keywords" content="text, in, the, keywords, tag" />
</head>
EOD;
$dom = new DOMDocument();
$dom->loadHTML($str);
$xpath = new DOMXPath($dom);
$nodes = $xpath->query('/html/head/meta[name="description"]');
foreach($nodes as $node){
print $node->nodeValue;
}
推荐答案
您可以使用 @ 后跟属性名称(见下文)来引用属性，并且可以直接查询属性；您的 XPath 查询几乎就在那里.
You can reference the attributes using @ followed by the attribute name (see below), and you can query directly for the attributes; your XPath query was almost there.
// Look for the content attribute of description meta tags
$contents = $xpath->query('/html/head/meta[@name="description"]/@content');
// If nothing matches the query
if ($contents->length == 0) {
echo "No description meta tag :(";
// Found one or more descriptions, loop over them
} else {
foreach ($contents as $content) {
echo $content->value . PHP_EOL;
}
}
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