/**
* Yahoo currency rate import class
*
* @author Felix Geenen (http://www.geenen-it-systeme.de)
* @version 1.0.3
*/
class Yahoofinance
{ public static $_url = 'http://download.finance.yahoo.com/d/quotes.csv?s={{CURRENCY_FROM}}{{CURRENCY_TO}}=X&f=l1&e=.csv'; public static $_messages = array();
/*
* converts currency rates
*
* use ISO-4217 currency-codes like EUR and USD (http://en.wikipedia.org/wiki/ISO_4217)
*
* @param currencyFrom String base-currency
* @param currencyTo String currency that currencyFrom should be converted to
* @param retry int change it to 1 if you dont want the method to retry receiving data on errors
*/
public static function _convert($currencyFrom, $currencyTo, $retry=0)
{ $url = str_replace('{{CURRENCY_FROM}}', $currencyFrom, self::$_url); $url = str_replace('{{CURRENCY_TO}}', $currencyTo, $url);
try { $handle = fopen($url, "r");
if($handle !== false) { $exchange_rate = fread($handle, 2000);
# there may be spaces or breaks
$exchange_rate = trim($exchange_rate);
$exchange_rate = (float) $exchange_rate;
fclose($handle);
if( !$exchange_rate ) { echo 'Cannot retrieve rate from Yahoofinance';
return false;
}
return (float) $exchange_rate * 1.0; // change 1.0 to influence rate;
}
}
catch (Exception $e) { if( $retry == 0 ) { # retry receiving data
self::_convert($currencyFrom, $currencyTo, 1);
} else { echo 'Cannot retrieve rate from Yahoofinance';
return false;
}
}
}
}
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