php DOMDocument adds headers with DOCTYPE declaration

问题

I'm adding a #b hash to each link via the DOMDocument class.

        $dom = new DOMDocument();
        $dom->loadHTML($output);

        $a_tags = $dom->getElementsByTagName('a');

        foreach($a_tags as $a)
        {
            $value = $a->getAttribute('href');
            $a->setAttribute('href', $value . '#b');
        }

        return $dom->saveHTML();

That works fine, however the returned output includes a DOCTYPE declaration and a <head> and <body> tag. Any idea why that happens or how I can prevent that?

回答1:

That's what DOMDocument::saveHTML() generally does, yes : generate a full HTML Document, with the Doctype declaration, the <head> tag, ...

Two possible solutions :

If you are working with PHP >= 5.3, saveHTML() accepts one additional parameter that might help you
- see The DOM Goodie in PHP 5.3.6 for more informations.
If you need your code to work with PHP < 5.3.6, you'll have to use some str_replace() or regex or whatever equivalent you can think of to remove the portions of HTML code you don't need.
- For an example, see this note in the manual's users notes.

回答2:

The real problem is the way the DOM is loaded. Use this instead: $html->loadHTML($content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

Please upvote the original answer here.

回答3:

Adding $doc->saveHTML(false); will not work and it will return a error because it expects a node and not bool.

The solution I used:

return preg_replace('/^<!DOCTYPE.+?>/', '', str_replace( array('<html>', '</html>', '<body>', '</body>'), array('', '', '', ''), $doc->saveHTML()));

I`m using PHP >5.4

回答4:

I solved this problem by creating new DOMDocument and copying child nodes from original to new one.

function removeDocType($oldDom) {
  $node = $oldDom->documentElement->firstChild
  $dom = new DOMDocument();
  foreach ($node->childNodes as $child) {
    $dom->appendChild($doc->importNode($child, true));
  }
  return $dom->saveHTML();
}

So insted of using

return $dom->saveHTML();

I use:

return removeDocType($dom);

来源：https://stackoverflow.com/questions/5444510/php-domdocument-adds-html-headers-with-doctype-declaration

标签

php

domdocument

php DOMDocument adds <html> headers with DOCTYPE declaration

问题

回答1:

回答2:

回答3:

回答4: