Real Time PHP Currency Converter Function

I have updated the PHP real time currency converter using quotes from Yahoo Finance which I original posted on March 2007.
http://www.codingforums.com/showthread.php?t=110434

The code below is fully functional and sample output is listed at the bottom. One feature that could be added is to write the exchange rate to a txt file for backup in case the function doesn't connect to Yahoo Finance which happens on rare occasions - this causes an error in the output.

PHP Code:
<?php
// #########################################################################
// September 09, 2012
// Real time PHP currency converter function with quotes from Yahoo Finance
// Written by Leonard Whistler
// lwhistler@gmail.com
// #########################################################################

function currencyExchange($amount,$baseCurrency,$quoteCurrency) {
$open fopen("http://quote.yahoo.com/d/quotes.csv?s=$baseCurrency[0]$quoteCurrency[0]=X&f=sl1d1t1c1ohgv&e=.csv""r");
$exchangeRate fread($open2000);
fclose($open);
$exchangeRate str_replace("\""""$exchangeRate);
$exchangeRate explode(","$exchangeRate);
$results = ($exchangeRate[1]*$amount);
$results number_format ($results2);
$amount number_format ($amount);
$timeStamp strtotime($exchangeRate[2]);
$timeStamp date('F d, Y'$timeStamp);
$timeStamp "$timeStamp $exchangeRate[3]";

echo 
"$timeStamp EST<br>";
echo 
"The $baseCurrency[0]/$quoteCurrency[0] exchange rate is $exchangeRate[1]<br>\n";
echo 
"$amount $baseCurrency[1] will buy $results $quoteCurrency[1]<br><br>\n";
}

// for additional currency ticker symbols visit: http://finance.yahoo.com/currency-converter
$usd = array('USD','US Dollars');
$eur = array('EUR','Euro');
$jpy = array('JPY','Japanese Yen');
$gbp = array('GBP','British Pounds');
$aud = array('AUD','Australian Dollars');
$chf = array('CHF','Swiss Francs');
$cad = array('CAD','Canadian Dollars');

// amount, base currency, quote currency.
currencyExchange("120",$usd,$eur);
currencyExchange("250",$cad,$gbp);
currencyExchange("440",$usd,$jpy);
currencyExchange("40000",$jpy,$gbp); 
?>

Sample output
Code:
September 09, 2012 7:55pm EST
The USD/EUR exchange rate is 0.7816
120 US Dollars will buy 93.79 Euro

September 09, 2012 7:55pm EST
The CAD/GBP exchange rate is 0.6385
250 Canadian Dollars will buy 159.63 British Pounds

September 09, 2012 7:55pm EST
The USD/JPY exchange rate is 78.26
440 US Dollars will buy 34,434.40 Japanese Yen

September 09, 2012 7:55pm EST
The JPY/GBP exchange rate is 0.008
40,000 Japanese Yen will buy 320.00 British Pounds