Forcing the output to be XHTML compliant

[TheiGuy]

I am using phpQuery to load and manipulate a fragment of XHTML.
However when I go to print the result it forces all single tags such
as <br /> to html versions <br>. Is there a way to force the output to
be XHTML compliant?

[Tobiasz Cudnik]

XHTML autodetection doesn't work for fragments.You need to specify
content-type ether by using newDocumentXHTML() or manually as param to
newDocument().

[TheiGuy]

Everytime I try to use newDocumentXHTML I get the error below. I have
checked the fragment and it is valid XHTML.

Fatal error: Uncaught exception 'Exception' with message 'Error
loading XML markup'

[Tobiasz Cudnik]

Then it may be true ;) How did you checked the fragment ?
You can try to force output by changing $doc->documentWrapper->isXML
flag to true or directly using saveXML() on $doc->document object, but
both ways are not recommended.