php DOMDocument adds <html> headers with DOC

2019-06-16 04:12发布

站内问答 / PHP
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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?

4条回答
闹够了就滚
2楼-- · 2019-06-16 04:19

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.

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地球回转人心会变
3楼-- · 2019-06-16 04:25

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

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Animai°情兽
4楼-- · 2019-06-16 04:25

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);
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Lonely孤独者°
5楼-- · 2019-06-16 04:44

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
  • 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.
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