保留DomDocument中图像之间的换行符

Question

Consider this php code:

$content = '<img />'."

".'<img />';
$doc = new DomDocument();
$doc->loadHTML($content);
echo $doc->saveHTML();

The output (including the wrapping HTML/body etc) gives me:

<img><img>

with no space between the images.

Calling:

$doc->preserveWhiteSpace = true;

doesn't change anything.

How do I preserve the white space in the original HTML?

Answer 1

Answering my own question - it's buggy behaviour of an old version of libxml2:

https://bugs.php.net/bug.php?id=50278

This issue is solved by passing LIBXML_HTML_NODEFDTD as option when loading the document. This constant is available as of PHP 5.4.0 when libxml2 >= 2.7.8 is used. See http://3v4l.org/qs4TC.

The shared server I'm on uses 2.7.6 so not sure it helps me, but I can see if they can upgrade. Hope this helps someone else.