如何使用DOMDocument和DOMXPath回显元标题和元标记

Question

Using this function:

function get_tags($adres)
{
    $dom = new domDocument();
    libxml_use_internal_errors(true);
    if (!$dom->loadHTML($adres)) {
        echo "Error";
    } else echo "Load ok";
    $html = new DOMXPath($dom);
   $html->query('//title');
}

I try to get and echo title and keywords, description, robots meta tags using XPath, but don't know how and how must look query for meta tags.

Thanks

Answer 1

To retrieve the title, I use :

$titles = $xpath->query('/html/head/title');
foreach ($titles as $title) {
    $return['title'][] = $title->nodeValue;
}

Because it's possible that the DOM has multiple <title /> tags, though it is not recommended.

I then parse all the <meta /> tags, as such :

$metas = $xpath->query('/html/head/meta');
foreach ($metas as $meta) {
    $name = strtolower($meta->getAttribute('name'));
    if ($name == 'title' && (!isset($return['title']) || $return['title'] == '')) // There is such a thing as <meta name="title" \>
        $return['title'][] = $meta->getAttribute('content');
    if ($name == 'keywords')
        $return['metakw'][] = $meta->getAttribute('content');
    if ($name == 'description')
        $return['metadesc'][] = $meta->getAttribute('content');
    if ($name == 'robots')
        $return['robots'][] = $meta->getAttribute('content');
}

But I guess it would be possible to use :

$metas_title = $xpath->query('/html/head/meta[@name="title"]');
$metas_desc = $xpath->query('/html/head/meta[@name="description"]');
$metas_kw = $xpath->query('/html/head/meta[@name="keywords"]');
$metas_robots = $xpath->query('/html/head/meta[@name="robots"]');