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PHP货币换算程序代码

发布时间:2022-06-23 09:36:50 所属栏目:站长百科 来源:互联网
导读:?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 redi
  <?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();
     }
    
  }
    
  ?>
   
 
  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)。
 
  <?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');
  ?>

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