PHP实现货币换算的方法

mysql_host = $host; $this->mysql_user = $user; $this->mysql_pass = $pass; $this->mysql_db = $db; $this->mysql_table = $tb; $this->checkLastUpdated(); $conn = mysql_connect($this->mysql_host,$this->mysql_user,$this->mysql_pass); $rs = mysql_select_db($this->mysql_db,$conn); $sql = "SELECT * FROM ".$this->mysql_table; $rs = mysql_query($sql,$conn); while($row = mysql_fetch_array($rs)) { $this->exchange_rates[$row['currency']] = $row['rate']; } } /* Perform the actual conversion,defaults to £1.00 GBP to USD */ function convert($amount=1,$from="GBP",$to="USD",$decimals=2) { return(number_format(($amount/$this->exchange_rates[$from])*$this->exchange_rates[$to],$decimals)); } /* Check to see how long since the data was last updated */ function checkLastUpdated() { $conn = mysql_connect($this->mysql_host,$conn); $sql = "SHOW TABLE STATUS FROM ".$this->mysql_db." LIKE '".$this->mysql_table."'"; $rs = mysql_query($sql,$conn); if(mysql_num_rows($rs) == 0 ) { $this->createTable(); } else { $row = mysql_fetch_array($rs); if(time() > (strtotime($row["Update_time"])+(12*60*60)) ) { $this->downloadExchangeRates(); } } } /* Download xml file,extract exchange rates and store values in database */ function downloadExchangeRates() { $currency_domain = substr($this->xml_file,strpos($this->xml_file,"/")); $currency_file = substr($this->xml_file,"/")); $fp = @fsockopen($currency_domain,80,$errno,$errstr,10); if($fp) { $out = "GET ".$currency_file." HTTP/1.1rn"; $out .= "Host: ".$currency_domain."rn"; $out .= "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5rn"; $out .= "Connection: Closernrn"; fwrite($fp,$out); while (!feof($fp)) { $buffer .= fgets($fp,128); } fclose($fp); $pattern = "{}is"; preg_match_all($pattern,$buffer,$xml_rates); array_shift($xml_rates); for($i=0;$imysql_host,$conn); foreach($exchange_rate as $currency=>$rate) { if((is_numeric($rate)) && ($rate != 0)) { $sql = "SELECT * FROM ".$this->mysql_table." WHERE currency='".$currency."'"; $rs = mysql_query($sql,$conn) or die(mysql_error()); if(mysql_num_rows($rs) > 0) { $sql = "UPDATE ".$this->mysql_table." SET rate=".$rate." WHERE currency='".$currency."'"; } else { $sql = "INSERT INTO ".$this->mysql_table." VALUES('".$currency."',".$rate.")"; } $rs = mysql_query($sql,$conn) or die(mysql_error()); } } } } /* Create the currency exchange table */ function createTable() { $conn = mysql_connect($this->mysql_host,$conn); $sql = "CREATE TABLE ".$this->mysql_table." ( currency char(3) NOT NULL default '',rate float NOT NULL default '0',PRIMARY KEY(currency) ) ENGINE=MyISAM"; $rs = mysql_query($sql,$conn) or die(mysql_error()); $sql = "INSERT INTO ".$this->mysql_table." VALUES('EUR',1)"; $rs = mysql_query($sql,$conn) or die(mysql_error()); $this->downloadExchangeRates(); } } ?> 上面的代码复制到一个新文件并将其保存为CurrencyConverter.php。当你需要转换包含类文件,称为“转换”功能。你需要输入自己的mysql数据库变量如登录详细信息。下面的例子将￡2.50英镑转换成美元(美元)。 代码如下:

convert(2.50,'GBP','USD'); ?>

希望本文所述对大家的php程序设计有所帮助。

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