const XML_Char *encoding 

>  const XML_Char *encoding 
> 

$xml_parser = xml_parser_create();

$xml_parser = xml_parser_create('');

$rx = '/<?xml.*encoding=['"](.*?)['"].*?>/m';

if (preg_match($rx, $source, $m)) {
  $encoding = strtoupper($m[1]);
} else {
  $encoding = "UTF-8";
}

if($encoding == "UTF-8"|$encoding == "US-ASCII"|$encoding == "ISO-8859-1") {
  $parser = xml_parser_create($encoding);
} else {

  if(function_exists('mb_convert_encoding')) {
    $encoded_source = @mb_convert_encoding($source, "UTF-8", $encoding);
  }

  if($encoded_source != NULL) {
    $source = str_replace ( $m[0],'<?xml version="1.0" encoding="utf-8"?>', $encoded_source);
  }

  $parser = xml_parser_create("UTF-8");
}

xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8");