Description:
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When I execute the code on linux the dash (&#8211) is shown as a dash. This is because PHP adds a "Content-Type: text/html; charset=UTF-8" header (used firebug to view the info).
On my windows installation, however, the header isn't modified so my browser is displaying "–" instead of a dash.

Manually adding the header works, but it's only a workaround.

I've found a similar bugreport from two years:
http://bugs.php.net/bug.php?id=36415

Reproduce code:
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<?php
$xml = "<mytag>&amp;#8211 is a dash: &quot;&#8211;&quot;</mytag>";
$xmldoc = new DOMDocument();
$xmldoc->loadXML($xml);
$xsl = '<stylesheet xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0"/>';
$xsldoc = new DOMDocument();
$xsldoc->loadXML($xsl);
$proc = new XSLTProcessor();
$proc->importStylesheet($xsldoc);
echo $proc->transformToXML($xmldoc);
?>

Expected result:
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&#8211 is a dash: "?"

Actual result:
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&#8211 is a dash: "–"