Usps price calculator returns an empty array

Usps price calculator returns an empty array

I found the updated way of getting a price from USPS, I didn't write this
code (why rewrite something that's already written eh?), but I understand
how all of this works, what I don't understand is why I get an empty
array? What am I missing, or anything wrong here. Any help is appreciated
class UspsCalculator{
public function USPSParcelRate($weightLB, $weightOZ, $size, $dest_zip) {
$userName = '11111111'; //Fake Name for privacy purposes
$orig_zip = '33617';
$url = 'https://secure.shippingapis.com/ShippingAPITest.dll';
$servicecode = "IntlRateV2";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POST, 1);
$data = "API=RateV4&XML=<RateV4Request
USERID=\"$userName\"><Package
ID=\"1ST\"><Service>ALL</Service><ZipOrigination>$orig_zip</ZipOrigination><ZipDestination>$dest_zip</ZipDestination><Pounds>$weightLB</Pounds><Ounces>$weightOZ</Ounces><Container/><Size>$size</Size><Machinable>FALSE</Machinable></Package></RateV4Request>";
// print_r($data);
curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
$result=curl_exec ($ch);
$data = strstr($result, '<?');
print_r($data); // Uncomment to show XML in comments
$xml_parser = xml_parser_create();
xml_parse_into_struct($xml_parser, $data, $vals, $index);
xml_parser_free($xml_parser);
$params = array();
$level = array();
foreach ($vals as $xml_elem)
{
if ($xml_elem['type'] == 'open')
{
if (array_key_exists('attributes',$xml_elem))
{
list($level[$xml_elem['level']],$extra) =
array_values($xml_elem['attributes']);
} else
{
$level[$xml_elem['level']] = $xml_elem['tag'];
}
}
if ($xml_elem['type'] == 'complete') {
$start_level = 1;
$php_stmt = '$params';
while($start_level < $xml_elem['level']) {
$php_stmt .= '[$level['.$start_level.']]';
$start_level++;
}
$php_stmt .= '[$xml_elem[\'tag\']] = $xml_elem[\'value\'];';
eval($php_stmt);
}
}
curl_close($ch);
// echo '<pre>'; print_r($params); echo'</pre>'; // to see the
full array
return $params['RATEV3RESPONSE']['1ST'][$servicecode]['RATE'];
}
}
?>