我可以使用DOM回显W3C规范中的所有HTML标记吗？

Question

I'm using this simple PHP HTML parser: http://simplehtmldom.sourceforge.net. Is it possible to use it to echo all tags of the HTML specification?

Answer 1

Here you go:

$dom = new DOMDocument;
$dom->load('http://www.w3.org/2002/08/xhtml/xhtml1-transitional.xsd');
$xsns = 'http://www.w3.org/2001/XMLSchema';
$elements = array();
foreach ($dom->getElementsByTagNameNS($xsns, 'element') as $element) {
    if ($element->hasAttribute('name')) {
        echo $element->getAttribute('name');
        $docs = $element->getElementsByTagNameNS($xsns, 'documentation');
        foreach ($docs as $doc) {
            echo "\t", $doc->nodeValue;
        }
        echo PHP_EOL;
    }
}

The above code will output all the Element types in the Schema definition (not DTD) for XHTML1 Transitional (not HTML) plus any documentation, e.g.

pre
      content is "Inline" excluding
         "img|object|applet|big|small|sub|sup|font|basefont"

It uses PHP's native DOM extension to do that. The DOM extension uses libxml underneath and is superior to SimpleHtmlDom in terms of speed and offered control over the markup. The DOM interface is a language agnostic W3C specification.

For alternatives to the DOM extension see

• Best methods to parse HTML (most of these apply to XML too)