PHP implementation of currency conversion method, PHP implementation of currency conversion _php Tutorial

PHP implementation of currency conversion method, PHP implementation of currency conversion

In this paper, the method of implementing currency conversion in PHP is described. Share to everyone for your reference.

The specific implementation code is as follows:
Copy CodeThe code is as follows: <?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 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 ();
}
}
?>
The above code is copied to a new file and saved as currencyconverter.php. When you need to convert a containing class file, it is called the "transform" feature. You need to enter your own MySQL database variables such as login details. The following example converts ￡ £ 2.50 to USD (USD).
Copy CodeThe code is as follows: <?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 ');
?>

I hope this article is helpful to everyone's PHP programming.

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