php DOMDocument adds <html> 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? — hakre
– hakre, Commented Jul 3, 2013 at 5:00
Possible duplicate of How to saveHTML of DOMDocument without HTML wrapper? — miken32
– miken32, Commented Nov 2, 2018 at 2:05

codewario · Accepted Answer · 2022-05-20 18:37:59Z

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, 2022 at 18:37

codewario

22k25 gold badges107 silver badges179 bronze badges

answered Dec 9, 2015 at 0:40

Tiago A.

2,5961 gold badge24 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Pascal MARTIN · Accepted Answer · 2011-03-26 19:03:36Z

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, 2011 at 19:03

Pascal MARTIN

402k82 gold badges665 silver badges666 bronze badges

4 Comments

matt Over a year ago

the second link works fine for me - preg_replace solution is the key! thank you!

Pascal MARTIN Over a year ago

You're welcome :-) (and the guys who post users notes on manual pages are more to be thanked than me, in this case ;-) )

Ben Sinclair Over a year ago

I used the first option as I am using PHP >= 5.3 and it worked great. $doc->saveHTML(false);

Timo Huovinen Over a year ago

@BenSinclair I am also using PHP >= 5.3 and $doc->saveHTML(false) throws the error <b>Warning</b>: DOMDocument::saveHTML() expects parameter 1 to be DOMNode, boolean given

CGeorges · Accepted Answer · 2014-03-06 13:39:52Z

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 6, 2014 at 13:39

answered Feb 20, 2014 at 16:58

CGeorges

4884 silver badges16 bronze badges

Comments

Sigismund · Accepted Answer · 2016-03-30 11:17:29Z

0

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);

answered Mar 30, 2016 at 11:17

Sigismund

1,1029 silver badges21 bronze badges

Comments

Yhensel Benitez Tapia · Accepted Answer · 2021-09-17 11:44:38Z

0

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);

answered Sep 17, 2021 at 11:44

Yhensel Benitez Tapia

611 silver badge3 bronze badges

Collectives™ on Stack Overflow

php DOMDocument adds <html> headers with DOCTYPE declaration

5 Answers 5

Comments

4 Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

4 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related