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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;
}
674
A meta description tag generally informs and interests users with a short, relevant summary of what a particular page is about. They are like a pitch that convince the user that the page is exactly what they're looking for.
Definition and Usage. The <meta> tag defines metadata about an HTML document. Metadata is data (information) about data. <meta> tags always go inside the <head> element, and are typically used to specify character set, page description, keywords, author of the document, and viewport settings.
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;
}
}
You have two problems. First, name is an attribute so you need to prepend @,
$nodes = $xpath->query('/html/head/meta[@name="description"]');
Second, the nodes are all empty so there is nothing to print.
To print the attribute value, do this,
foreach($nodes as $node){
$attr = $node->getAttribute('content');
print $attr;
}
In stead of including the /html/head part you could also use double slash which means that the following node can be anywhere in the code:
//meta[@name='description']
Will give the same result as:
/html/head/meta[@name='description']
Doesn't really matter much but it's less typing...
40
Last but not least, and sorry for reviving this thread, the queries are case sensitive.
In other words, if you look for meta name="description"... or "meta name="keywords", it will not find "meta name="Description"... or "meta name="Keywords"... respectively. So careful with that!
And I can tell you, after working a while with xdom and metatags, eventually I believe that the best approach for that is to use this function: http://php.net/manual/es/function.get-meta-tags.php
29
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