PHP Currency Conversion program Code _php Tutorial

Source: Internet
Author: User
A Practical PHP currency conversion program code Oh, the need for friends can refer to.
The code is as follows Copy Code

/*
* 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 was 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 was distributed in the hope that it'll 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-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 is 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, $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 ();
}

}

?>


Copy The above code into a new file and save it as currencyconverter.php. Whenever need to make a conversion just include the class file and the ' Convert ' function. You'll need to enter your own MySQL database variables such as the login details. The example below would convert£2.50 GBP into US Dollars ($).

The code is as follows Copy Code

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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