with the php domdocument class was getting the following error:

Warning: main() [function.main]: unterminated entity reference 64-bit

this error was occurring when trying to set the name of an anchor element … the same error popped up when setting both within the constructor and through the nodeValue method. I haven’t tested the solution via the constructor, but by wrapping the value with the built-in htmlspecialchars(), I solved this error

i.e.:
$anchornode = $doc->createElement(‘a’);
$anchornode->nodeValue = htmlspecialchars(“$somevalue”);