public static function exchange($amount, $from = 'NZD', $to = 'CNY')
{
$url = "http://www.google.com/finance/converter?a={$amount}&from={$from}&to={$to}";
if ($data = RPC::fetch($url)) {
$dom = new \DOMDocument();
@$dom->loadHTML($data);
$finder = new \DomXPath($dom);
$classname = "bld";
$nodes = $finder->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' {$classname} ')]");
$node = $nodes->item(0)->nodeValue;
$amount = str_replace(' CNY', '', $node);
return number_format($amount, 2, '.', ',');
}
return false;
}