Подсветка XML-кода

function highlight_xml($text)
{
return '<code>'.nl2br(
  preg_replace("~("|')[^<>]*("|')~iU", '<span style="color: #DD0000">$0</span>',
  preg_replace("~<!--.*-->~iU", '<span style="color: #FF8000">$0</span>',
  preg_replace("~(<[^\s!]*\s)([^<>]*)([/?]?>)~iU", '$1<span style="color: #007700">$2</span>$3',
  preg_replace("~<[^<>]*>~iU", '<span style="color: #0000BB">$0</span>',
  htmlspecialchars($text,ENT_QUOTES)))))).'</code>';
}

$text='<strong>тело</strong><br/>';

echo highlight_xml($text);