PHP DOMDocument adds extra tags
Question
I'm trying to parse a document and get all the image tags and change the source for something different.
$domDocument = new DOMDocument();
$domDocument->loadHTML($text);
$imageNodeList = $domDocument->getElementsByTagName('img');
foreach ($imageNodeList as $Image) {
$Image->setAttribute('src', 'lalala');
$domDocument->saveHTML($Image);
}
$text = $domDocument->saveHTML();
The $text initially looks like this:
<p>Hi, this is a test, here is an image<img src="http://example.com/beer.jpg" width="60" height="95" /> Because I like Beer!</p>
and this is the output $text :
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><p>Hi, this is a test, here is an image<img src="lalala" width="68" height="95"> Because I like Beer!</p></body></html>
I'm getting a bunch of extra tags (HTML, body, and the comment at the top) that I don't really need. Any way to set up the DOMDocument to avoid adding these extra tags?
5 answers
solution1
20 2015-07-15 09:22:38
You just need to add 2 flags to the loadHTML() method: LIBXML_HTML_NOIMPLIED|LIBXML_HTML_NODEFDTD . Ie
$domDocument->loadHTML($text, LIBXML_HTML_NOIMPLIED|LIBXML_HTML_NODEFDTD);
See IDEONE demo :
$text = '<p>Hi, this is a test, here is an image<img src="http://example.com/beer.jpg" width="60" height="95" /> Because I like Beer!</p>';
$domDocument = new DOMDocument;
$domDocument->loadHTML($text, LIBXML_HTML_NOIMPLIED|LIBXML_HTML_NODEFDTD);
$imageNodeList = $domDocument->getElementsByTagName('img');
foreach ($imageNodeList as $Image) {
$Image->setAttribute('src', 'lalala');
$domDocument->saveHTML($Image);
}
$text = $domDocument->saveHTML();
echo $text;
Output:
<p>Hi, this is a test, here is an image<img src="lalala" width="60" height="95"> Because I like Beer!</p>
solution2
5 ACCPTED 2011-01-26 01:39:47
DomDocument is unfortunately retarded and won't let you do this. Try this:
$text = preg_replace('/^<!DOCTYPE.+?>/', '', str_replace( array('<html>', '</html>', '<body>', '</body>'), array('', '', '', ''), $domDocument->saveHTML()));
solution3
1 2011-01-26 00:59:04
If you are up to a hack, this is the way I managed to go around this annoyance. Load the string as XML and save it as HTML. :)
solution4
0 2015-01-12 23:09:56
you can use http://beerpla.net/projects/smartdomdocument-a-smarter-php-domdocument-class/ :
DOMDocument has an extremely badly designed "feature" where if the HTML code you are loading does not contain and tags, it adds them automatically (yup, there are no flags to turn this behavior off).
Thus, when you call $doc->saveHTML(), your newly saved content now has and DOCTYPE in it. Not very handy when trying to work with code fragments (XML has a similar problem).
SmartDOMDocument contains a new function called saveHTMLExact() which does exactly what you would want – it saves HTML without adding that extra garbage that DOMDocument does.
solution5
-2 2011-01-26 00:51:41
If you're going to save as HTML, you have to expect a valid HTML document to be created!
There is another option: DOMDocument::saveXML has an optional parameter allowing you to access the XML content of a particular element:
$el = $domDocument->getElementsByTagName('p')->item(0);
$text = $domDocument->saveXML($el);
This presumes that your content only has one p element.
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