php DOMDocument adds <html> headers with DOCTYPE declaration

W

5

9

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?

Word answered 26/3, 2011 at 18:54 Comment(2)

possible duplicate of PHP + DOMDocument: outerHTML for element? – Datura 3/7, 2013 at 5:0

Possible duplicate of How to saveHTML of DOMDocument without HTML wrapper? – Runway 2/11, 2018 at 2:5

A

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.

Araliaceous answered 26/3, 2011 at 19:3 Comment(4)

the second link works fine for me - preg_replace solution is the key! thank you! – Word 26/3, 2011 at 19:20

You're welcome :-) (and the guys who post users notes on manual pages are more to be thanked than me, in this case ;-) ) – Araliaceous 26/3, 2011 at 19:21

I used the first option as I am using PHP >= 5.3 and it worked great. $doc->saveHTML(false); – Quad 21/10, 2013 at 7:29

@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 – Mestizo 16/3, 2014 at 15:7

H

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.

Honorarium answered 9/12, 2015 at 0:40 Comment(0)

A

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.

Araliaceous answered 26/3, 2011 at 19:3 Comment(4)

the second link works fine for me - preg_replace solution is the key! thank you! – Word 26/3, 2011 at 19:20

You're welcome :-) (and the guys who post users notes on manual pages are more to be thanked than me, in this case ;-) ) – Araliaceous 26/3, 2011 at 19:21

I used the first option as I am using PHP >= 5.3 and it worked great. $doc->saveHTML(false); – Quad 21/10, 2013 at 7:29

@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 – Mestizo 16/3, 2014 at 15:7

I

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

Inane answered 20/2, 2014 at 16:58 Comment(0)

A

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);

Aubry answered 30/3, 2016 at 11:17 Comment(0)

M

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);

Mortimer answered 17/9, 2021 at 11:44 Comment(0)

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