php DOMDocument adds headers with DOCTYPE declaration

Question

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?

possible duplicate of [PHP + DOMDocument: outerHTML for element?](http://stackoverflow.com/questions/5404941/php-domdocument-outerhtml-for-element) — hakre, Jul 03 '13 at 05:00
Possible duplicate of [How to saveHTML of DOMDocument without HTML wrapper?](https://stackoverflow.com/questions/4879946/how-to-savehtml-of-domdocument-without-html-wrapper) — miken32, Nov 02 '18 at 02:05

score 6 · Answer 1 · edited May 20 '22 at 18:37

6

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.

edited May 20 '22 at 18:37

codewario

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answered Dec 09 '15 at 00:40

Tiago A.

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score 5 · Accepted Answer · answered Mar 26 '11 at 19:03

5

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.

answered Mar 26 '11 at 19:03

Pascal MARTIN

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the second link works fine for me - preg_replace solution is the key! thank you! – matt Mar 26 '11 at 19:20
2

You're welcome :-) *(and the guys who post users notes on manual pages are more to be thanked than me, in this case ;-) )* – Pascal MARTIN Mar 26 '11 at 19:21
I used the first option as I am using PHP >= 5.3 and it worked great. `$doc->saveHTML(false);` – Ben Sinclair Oct 21 '13 at 07:29
@BenSinclair I am also using PHP >= 5.3 and `$doc->saveHTML(false)` throws the error `Warning: DOMDocument::saveHTML() expects parameter 1 to be DOMNode, boolean given` – Timo Huovinen Mar 16 '14 at 15:07

CGeorges · Answer 3 · 2014-03-06T13:39:52.447

2

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

edited Mar 06 '14 at 13:39

answered Feb 20 '14 at 16:58

CGeorges

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score 0 · Answer 4 · answered Mar 30 '16 at 11:17

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);

score 0 · Answer 5 · answered Sep 17 '21 at 11:44

I was in the case where I want the html wrapper but not the DOCTYPE, the solution was in line with Tiago A.:

// Avoid adding the DOCTYPE header    
$dom->loadHTML($bodyContent, LIBXML_HTML_NODEFDTD);

// Avoid adding the DOCTYPE header AND html/body wrapper
$dom->loadHTML($bodyContent, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

php DOMDocument adds headers with DOCTYPE declaration

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