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Google is a wonderful ! While most of us use it for searching the web for information , few are aware that it has an inbuilt calculator which can also be used for converting a currency into another . Doing so is really simple , you just type ” AMOUNT CURRENCY_CONVERTING_FROM in CURRENCY_CONVERTING_TO ” and search , the inbuilt calculator will give you the result .For example , if one wants to convert 1 U.S Dollar into Euro , he shall type “1 USD in EUR” .

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Now lets get to the topic of this post , Google also has a secret calculator API ( http://www.google.com/ig/calculator ) that is usually used for iGoogle gadgets , but since its free and open , anyone can use it .

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So if you want to convert a currency into another using the API , your callback URL would look like :

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www.google.com/ig/calculator?hl=en&q=AMOUNT-FROM_CURRENCY=?TO_CURRENCY
// 1 USD in EUR example
www.google.com/ig/calculator?hl=en&q=1USD=?EUR

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In the above example , you get a string which looks like "{lhs: "1 U.S. dollar",rhs: "0.838574423 Euros",error: "",icc: true}" . You can easily explode() the string using php and extract the required data .

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To make things easier for you , here is a simple php function that converts a currency into another using the Google calculator API . This example uses cURL , so you have to have it enabled for this code to work .

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To make things easier for you , here is a simple php function that converts a currency into another using the Google calculator API . This example uses cURL , so you have to have it enabled for this code to work .

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<?php
function currency($from_Currency,$to_Currency,$amount) {
	$amount = urlencode($amount);
	$from_Currency = urlencode($from_Currency);
	$to_Currency = urlencode($to_Currency);
	$url = "http://www.google.com/ig/calculator?hl=en&q=$amount$from_Currency=?$to_Currency";
	$ch = curl_init();
	$timeout = 0;
	curl_setopt ($ch, CURLOPT_URL, $url);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch,  CURLOPT_USERAGENT , "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
	curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
	$rawdata = curl_exec($ch);
	curl_close($ch);
	$data = explode('"', $rawdata);
	$data = explode(' ', $data[3]);
	$var = $data[0];
	return round($var,3);
}

?>

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The value returned by Google usually has 9 decimal places , you can round it off to a no. of digits after decimal of you choice using the round() function . By default the above function rounds the value to 3 digits after decimal .

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Now here is how you can use the function in your scripts

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<?php
//This will display current value of 1 USD in CNY ( China )
echo currency("USD","CNY",1);
?>

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Hope this has helped you with converting currencies using php on your website

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来源：?http://www.xe.com/ucc/full/?obsolete=yes

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附：货币

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<select name="From" size="10" tabindex="2">
	<option selected="selected" value="AFN">Afghanistan, Afghani (AFN)</option>
	<option value="ALL">Albania, Lek (ALL)</option>
	<option value="DZD">Algeria, Dinar (DZD)</option>
	<option value="USD">America (United States), Dollar (USD)</option>
	<option value="USD">American Samoa, United States Dollar (USD)</option>
	<option value="EUR">Andorra, Euro (EUR)</option>
	<option value="AOA">Angola, Kwanza (AOA)&