/**
* to_xml
*
* @param array $array
* @param string $default_tag
* @param bool $include_header
* @return void
* @author Kevin Morey
*/
public static function to_xml(array $array, $root_tag = '', $append_header = TRUE)
{
$out = $append_header ? '<?xml version="1.0" encoding="UTF-8"?>' . arr::$eol : '';
$out .= arr::parse_xml_value($array, $root_tag);
return $out;
}