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PHP货币换算程序代码

 代码如下

本文实例讲述了PHP实现货币换算的方法。分享给大家供大家参考。

<?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,$conn);
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      while($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();
   }
 
}
 
?>

具体实现代码如下:

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 ($).

复制代码 代码如下:

 代码如下

<?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();
   }
}
?>

<?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');
?>

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)。

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