Conversor de moneda usando la API de Google

index.php

<?php

	 /* conversor_divisas()
	 *
	 * Conversor de moneda usando la API de Google
	 */


	function currency($from, $to, $amount)
	{
	   $content = file_get_contents('https://www.google.com/finance/converter?a='.$amount.'&from='.$from.'&to='.$to);

	   $doc = new DOMDocument;
	   @$doc->loadHTML($content);
	   $xpath = new DOMXpath($doc);

	   $result = $xpath->query('//*[@id="currency_converter_result"]/span')->item(0)->nodeValue;

	   return str_replace(' '.$to, '', $result);
	}

	echo currency('USD', 'DOP', 1);


 ?>