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:
<?php /* * File: CurrencyConverter.php * Author: Simon Jarvis * Copyright: 2005 Simon Jarvis * Date: 10/12/05 * Link: http://HdhCmsTestwhite-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://HdhCmsTestgnu.org/licenses/gpl.html * */ class CurrencyConverter { var $xml_file = "HdhCmsTestecb.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)。复制代码 代码如下:
<?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'); ?>
希望本文所述对大家的php程序设计有所帮助。