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get meta description tag with xpath

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生来不讨喜
生来不讨喜 2021-02-07 06:39

I need the content the description and the keywords tag content. I have this code, but dont write anything. Idea?

$str = <<< EOD
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5条回答
  • 挽巷
    2021-02-07 07:08

    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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  • 耶瑟儿～
    2021-02-07 07:08

    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...

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  • 别那么骄傲
    2021-02-07 07:11

    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;
}
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  • 孤街浪徒
    2021-02-07 07:17

    Make sure that you put EOD; at a line without any spaces and indentation like:

      $str = <<< EOD
  <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

EOD;
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  • 不思量自难忘°
    2021-02-07 07:21

    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

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