PHP货币换算程序代码

代码如下

复制代码

<?php

/*
* File: CurrencyConverter.php
* Author: Simon Jarvis
* Copyright: 2005 Simon Jarvis
* Date: 10/12/05
* Link: http://www.white-hat-web-design.co.uk/articles/php-currency-conversion.php

*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/

class CurrencyConverter {

   var $xml_file = "www.ecb.int/stats/eurofxref/eurofxref-daily.xml";
   var $mysql_host, $mysql_user, $mysql_pass, $mysql_db, $mysql_table;
   var $exchange_rates = array();

   //Load Currency Rates

   function CurrencyConverter($host,$user,$pass,$db,$tb) {

      $this->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,$this->mysql_user,$this->mysql_pass);

      $rs = mysql_select_db($this->mysql_db,$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,0,strpos($this->xml_file,"/"));
      $currency_file = substr($this->xml_file,strpos($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);

         $pattern = "{<Cubes*currency='(w*)'s*rate='([d.]*)'/>}is";
         preg_match_all($pattern,$buffer,$xml_rates);
         array_shift($xml_rates);

         for($i=0;$i<count($xml_rates[0]);$i++) {

            $exchange_rate[$xml_rates[0][$i]] = $xml_rates[1][$i];
         }

         $conn = mysql_connect($this->mysql_host,$this->mysql_user,$this->mysql_pass);

         $rs = mysql_select_db($this->mysql_db,$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,$this->mysql_user,$this->mysql_pass);

      $rs = mysql_select_db($this->mysql_db,$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();
   }

}

?>

Copy the above code into a new file and save it as CurrencyConverter.php. Whenever you need to make a conversion just include the class file and call the ‘convert’ function. You will need to enter your own mysql database variables such as the login details. The example below will convert £2.50 GBP into US Dollars ($).

代码如下	复制代码
<?php include('CurrencyConverter.php'); $x = new CurrencyConverter('your_host','your_username','your_password','your_database_name','your_table_name'); echo $x->convert(2.50,'GBP','USD'); ?>

补充：Php教程,Php应用