这篇文章主要介绍了php实现货币换算的方法,以实例形式较为详细的讲述了货币转换的实现方法,并举英镑转换美元为例讲述具体用法,需要的朋友可以参考下
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。
具体实现代码如下：
复制代码 代码如下:
/*
* file: currencyconverter.php
* author: simon jarvis
* copyright: 2005 simon jarvis
* date: 10/12/05
* link:
*
* 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:
*
*
*/
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);
         $pattern = {}is;
         preg_match_all($pattern,$buffer,$xml_rates);
         array_shift($xml_rates);
         for($i=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();
   }
}
?>
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)。
复制代码 代码如下: