PHP generated XML shows invalid Char value 27 message

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A useful function to get rid of that error is suggested on this website.
http://www.phpwact.org/php/i18n/charsets#common_problem_areas_with_utf-8

When you put utf-8 encoded strings in a XML document you should remember that not all utf-8 valid chars are accepted in a XML document http://www.w3.org/TR/REC-xml/#charsets

So you should strip away the unwanted chars, else you’ll have an XML fatal parsing error such as above

function utf8_for_xml($string)
{
    return preg_replace ('/[^\x{0009}\x{000a}\x{000d}\x{0020}-\x{D7FF}\x{E000}-\x{FFFD}]+/u', ' ', $string);
}

Hope that saves someone else some time..

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