我一直在使用下面的脚本通过欧洲银行免费远程 xml 文件自动转换货币值。我的问题是，有时http://www.ecb.europa.euxml 文件会出现问题，因此自动货币转换会出错。
<?php
/*
File: currencyexchange.php
Author: Gary White
Last modified: July 6, 2005
Copyright (C) 2005, Gary White
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
included GNU General Public License for more details. If you
received this file without the gpl.txt file, you may view it at:
http://www.gnu.org/copyleft/gpl.html
See the readme.txt file for usage.
July 6, 2005 added the RON, Romania New Leu, to the currency list.
*/
// this simply gets an array of possible currency countries and names
$allCurrencies=getCurrencyNames();
class currencyExchange{
/////////////////////////////////////////////////////////////////////////////////////////
// Public Properties
// Note that these properties are public, but the values are all generated internally.
// You should consider them read only during normal usage.
// The only one you may want to access would be the $localFile property, if you wanted
// to change the name of the local file used to cache a copy of the data.
/////////////////////////////////////////////////////////////////////////////////////////
// $Supplier property will be the European Central Bank, assuming we get the data
var $Supplier="";
// $Date property is the date of the exchange rate publication
var $Date="";
// $Rates property is an associative array of rateobj objects with the three letter identifier as the array keys
var $Rates=array();
// $Source property will be either "Local" or "Remote" depending on where the data comes from
var $Source="";
// $Error property will contain any error messages generates along the way
var $Error="";
// $localFile property is the file name used to cache a local copy of the XML file
var $localFile="currencies_local.xml";
// $url property is the URL of the XML file at the European Central Bank
var $url="http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";
/////////////////////////////////////////////////////////////////////////////////////////
// Public Methods
/////////////////////////////////////////////////////////////////////////////////////////
function getData(){
$olderr=error_reporting(0);
$this->Source="Local";
if(file_exists($this->localFile)){
// load it
$this->xml=@file_get_contents($this->localFile);
$this->parse();
// check if it's a weekend
// what day of the week is it?
$weekday=date("w");
// if it's a Sunday or Saturday
if($weekday==0 || $weekday==6){
// go back to last Friday
$date=date("Y-m-d",strtotime("last Friday"));
} else {
$date=date("Y-m-d");
}
// if the date in the local file is not the same
// as our current date, or last Friday for weekends
if($this->Date!=$date){
// clear the data
$this->clearData();
// get the remote file
$this->xml=$this->getRemoteFile($this->url);
if($this->parse()){
$this->Source="Remote";
// write the remote file data to a local copy of the file
$this->saveLocalCopy();
}
} // if we have a local copy
}else{
$this->xml=$this->getRemoteFile($this->url);
if($this->xml)
// write the remote file data to a local copy of the file
$this->saveLocalCopy();
}
if(!$this->xml)
$this->error="Failed to get data";
else{
$this->parse();
}
// sort our rates on the keys
ksort($this->Rates);
error_reporting($olderr);
return count($this->Rates);
}
function getRemoteFile($url){
$curl_handle = curl_init();
// Where should we get the data?
curl_setopt ($curl_handle, CURLOPT_URL, $url);
// This says not to dump it directly to the output stream, but instead
// have it return as a string.
curl_setopt ($curl_handle, CURLOPT_RETURNTRANSFER, 1);
// the following is optional, but you should consider setting it
// anyway. It prevents your page from hanging if the remote site is
// down.
curl_setopt ($curl_handle, CURLOPT_CONNECTTIMEOUT, 1);
// Now, YOU make the call.
$buffer = curl_exec($curl_handle);
// And tell it to shut down (when your done. You can always make more
// calls if you want.)
curl_close($curl_handle);
// This is where i�d probably do some extra checks on what i just got.
// Paranoia pays dividends.
return $buffer;
}
function Convert($from, $to, $amount=1){
// Converts from one currency to another. The method expects at least two
// parameters. The first param , $from, it the three letter identifier for
// the currency you are converting from. The second param, $to, is the
// three letter identifier for the currency you are converting to. The final
// param, $amount, is the amount of the $from currency to convert. If omitted
// the amount defaults to 1 and the function will return the amount of $to
// currency that corresponds with 1 unit of the $from currency.
if(array_key_exists($from, $this->Rates) && array_key_exists($to, $this->Rates)){
return ($amount * (($this->Rates[$to]->rate)/($this->Rates[$from]->rate)));
}else{
$this->Error->Error = "";
if (!array_key_exists($from, $this->Rates))
$this->Error->Error.="$from is not a recognized currency identifier ";
if (!array_key_exists($from, $this->Rates))
$this->Error->Error.="$to is not a recognized currency identifier";
return false;
}
}
function setBaseCurrency($currency){
// This function converts all currencies to be based on one unit of
// $base currency. It's only really useful if you want to output a
// table of conversion factors.
// get a factor to do our conversion based on our base currency
$factor=$this->Rates[$currency]->rate;
// modify the rates based on the base currency
foreach(array_keys($this->Rates) as $k){
$rate=$this->Rates[$k]->rate / $factor;
$this->Rates[$k]->rate=$rate;
}
return (count($this->Rates)>0);
}
/////////////////////////////////////////////////////////////////////////////////////////
// Private Methods
// You should not need to call any of the following methods.
/////////////////////////////////////////////////////////////////////////////////////////
function clearData(){
$this->Supplier="";
$this->Date="";
$this->Rates=array();
$this->Source="";
$this->xml="";
}
function saveLocalCopy(){
$fp=fopen($_SERVER['DOCUMENT_ROOT'].$this->localFile,"w") or die("failed to write file");
fwrite($fp,$this->xml);
fclose($fp);
$this->parse();
$this->Source="Remote";
}
function parse(){
if($this->xml){
$this->parser = xml_parser_create();
@xml_set_object($this->parser, $this);
@xml_set_element_handler($this->parser, "startElement", "endElement");
@xml_set_character_data_handler($this->parser, "characterData");
$this->Rates['EUR']=new rateobj();
$this->Rates['EUR']->rate=1.00;
$this->Rates['EUR']->currency="Euro";
xml_parse($this->parser, $this->xml, true)
or die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($parser)),
xml_get_current_line_number($parser)));
xml_parser_free($this->parser);
}
}
function currencyExchange(){
$dir=pathinfo($_SERVER['PHP_SELF']);
$dir=$dir['dirname'];
$this->localFile="$dir/$this->localFile";
}
function startElement($parser, $name, $attrs) {
global $allCurrencies;
$this->temp="";
$gwCurrencyExch=&$GLOBALS['gwCurrencyExch'];
if($name=="CUBE"){
if(array_key_exists("TIME",$attrs)){
$this->Date=$attrs["TIME"];
}
if(array_key_exists("CURRENCY",$attrs)){
$this->Rates[$attrs["CURRENCY"]]=new rateobj();
$this->Rates[$attrs["CURRENCY"]]->rate=$attrs["RATE"];
$this->Rates[$attrs["CURRENCY"]]->currency=$allCurrencies[$attrs["CURRENCY"]];
}
}
}
function characterData($parser, $data){
$this->temp.=$data;
}
function endElement($parser, $name) {
switch($name){
case "GESMES:NAME":
$this->Supplier=$this->temp;
break;
case "GESMES:SUBJECT":
$this->Report=$this->temp;
break;
}
$temp="";
}
} // end of ratelist class
class gwSocket{
var $ClassName="gwSocket";
var $Version="0.6";
var $error="";
var $headers;
var $maxRedirects=3;
var $page="";
var $result="";
var $redirects=0;
var $userAgent="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)";
function getUrl( $url ) {
$retVal="";
$url_parsed = parse_url($url);
$scheme = $url_parsed["scheme"];
$host = $url_parsed["host"];
$port = $url_parsed["port"]?$url_parsed["port"]:"80";
$user = $url_parsed["user"];
$pass = $url_parsed["pass"];
$path = $url_parsed["path"]?$url_parsed["path"]:"/";
$query = $url_parsed["query"];
$anchor = $url_parsed["fragment"];
if (!empty($host)){
// attempt to open the socket
if($fp = fsockopen($host, $port, $errno, $errstr, 2)){
$path .= $query?"?$query":"";
$path .= $anchor?"$anchor":"";
// this is the request we send to the host
$out = "GET $path ".
"HTTP/1.0\r\n".
"Host: $host\r\n".
"Connection: Close\r\n".
"User-Agent: $this->userAgent\r\n";
if($user)
$out .= "Authorization: Basic ".
base64_encode("$user:$pass")."\r\n";
$out .= "\r\n";
fputs($fp, $out);
while (!feof($fp)) {
$retVal.=fgets($fp, 128);
}
fclose($fp);
} else {
$this->error=$errstr;
}
$this->result=$retVal;
$this->headers=$this->parseHeaders(trim(substr($retVal,0,strpos($retVal,"\r\n\r\n"))));
$this->page=trim(stristr($retVal,"\r\n\r\n"))."\n";
if(isset($this->headers['Location'])){
$this->redirects++;
if($this->redirects<$this->maxRedirects){
$location=$this->headers['Location'];
$this->headers=array();
$this->result="";
$this->page="";
$this->getUrl($location);
}
}
}
return (!$retVal="");
}
function parseHeaders($s){
$h=preg_split("/[\r\n]/",$s);
foreach($h as $i){
$i=trim($i);
if(strstr($i,":")){
list($k,$v)=explode(":",$i);
$hdr[$k]=substr(stristr($i,":"),2);
}else{
if(strlen($i)>3)
$hdr[]=$i;
}
}
if(isset($hdr[0])){
$hdr['Status']=$hdr[0];
unset($hdr[0]);
}
return $hdr;
}
} // end of gwSocket class
class rateobj{
var $currency="";
var $rate=0;
}
function getCurrencyNames(){
$retVal['AED']="United Arab Emirates Dirham";
$retVal['AFA']="Afghanistan Afghani";
$retVal['ALL']="Albania Leke";
$retVal['ARS']="Argentina Peso";
$retVal['ATS']="Austria Schilling*";
$retVal['AUD']="Australia Dollar";
$retVal['BBD']="Barbados Dollar";
$retVal['BDT']="Bangladesh Taka";
$retVal['BEF']="Belgium Franc*";
$retVal['BGN']="Bulgaria Leva";
$retVal['BHD']="Bahrain Dinar";
$retVal['BMD']="Bermuda Dollar";
$retVal['BRL']="Brazil Reai";
$retVal['BSD']="Bahamas Dollar";
$retVal['CAD']="Canada Dollar";
$retVal['CHF']="Switzerland Franc";
$retVal['CLP']="Chile Peso";
$retVal['CNY']="China Yuan Renminbi";
$retVal['COP']="Colombia Peso";
$retVal['CRC']="Costa Rica Colone";
$retVal['CYP']="Cyprus Pound";
$retVal['CZK']="Czech Republic Koruny";
$retVal['DEM']="Germany Deutsche Mark*";
$retVal['DKK']="Denmark Kroner";
$retVal['DOP']="Dominican Republic Peso";
$retVal['DZD']="Algeria Dinar";
$retVal['EEK']="Estonia Krooni";
$retVal['EGP']="Egypt Pound";
$retVal['ESP']="Spain Peseta*";
$retVal['EUR']="Euro";
$retVal['FIM']="Finland Markkaa*";
$retVal['FJD']="Fiji Dollar";
$retVal['FRF']="France Franc*";
$retVal['GBP']="United Kingdom Pound";
$retVal['GRD']="Greece Drachmae*";
$retVal['HKD']="Hong Kong Dollar";
$retVal['HRK']="Croatia Kuna";
$retVal['HUF']="Hungary Forint";
$retVal['IDR']="Indonesia Rupiahs";
$retVal['IEP']="Ireland Pounds*";
$retVal['ILS']="Israel New Shekel";
$retVal['INR']="India Rupee";
$retVal['IQD']="Iraq Dinar";
$retVal['IRR']="Iran Rial";
$retVal['ISK']="Iceland Kronur";
$retVal['ITL']="Italy Lire*";
$retVal['JMD']="Jamaica Dollar";
$retVal['JOD']="Jordan Dinar";
$retVal['JPY']="Japan Yen";
$retVal['KES']="Kenya Shilling";
$retVal['KRW']="South Korea Won";
$retVal['KWD']="Kuwait Dinar";
$retVal['LBP']="Lebanon Pound";
$retVal['LKR']="Sri Lanka Rupee";
$retVal['LTL']="Lithuanian Lita";
$retVal['LVL']="Latvian Lat";
$retVal['LUF']="Luxembourg Franc*";
$retVal['MAD']="Morocco Dirham";
$retVal['MTL']="Malta Liri";
$retVal['MUR']="Mauritius Rupee";
$retVal['MXN']="Mexico Peso";
$retVal['MYR']="Malaysia Ringgit";
$retVal['NLG']="Dutch (Netherlands) Guilder*";
$retVal['NOK']="Norway Kroner";
$retVal['NZD']="New Zealand Dollar";
$retVal['OMR']="Oman Rial";
$retVal['PEN']="Peru Nuevos Sole";
$retVal['PHP']="Philippines Peso";
$retVal['PKR']="Pakistan Rupee";
$retVal['PLN']="Poland Zlotych";
$retVal['PTE']="Portugal Escudo*";
$retVal['QAR']="Qatar Riyal";
$retVal['ROL']="Romania Lei";
$retVal['RON']="Romania New Leu";
$retVal['RUB']="Russia Ruble";
$retVal['SAR']="Saudi Arabia Riyal";
$retVal['SDD']="Sudan Dinar";
$retVal['SEK']="Sweden Kronor";
$retVal['SGD']="Singapore Dollar";
$retVal['SIT']="Slovenia Tolar";
$retVal['SKK']="Slovakia Koruny";
$retVal['THB']="Thailand Baht";
$retVal['TND']="Tunisia Dinar";
$retVal['TRL']="Turkey Lira*";
$retVal['TRY']="Turkey New Lira";
$retVal['TTD']="Trinidad and Tobago Dollar";
$retVal['TWD']="Taiwan New Dollar";
$retVal['USD']="United States Dollar";
$retVal['VEB']="Venezuela Bolivare";
$retVal['VND']="Vietnam Dong";
$retVal['XAF']="CFA BEAC Franc";
$retVal['XAG']="Silver Ounce";
$retVal['XAU']="Gold Ounce";
$retVal['XCD']="Eastern Caribbean Dollar";
$retVal['XDR']="IMF Special Drawing Right";
$retVal['XOF']="CFA BCEAO Franc";
$retVal['XPD']="Palladium Ounce";
$retVal['XPF']="CFP Franc";
$retVal['XPT']="Platinum Ounce";
$retVal['ZAR']="South Africa Rand";
$retVal['ZMK']="Zambia Kwacha";
return $retVal;
}
?>
我想修改此代码以首先检查
var $url="http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";（远程 URL）是否存在（站点或链接在线），如果不存在（站点或链接离线），然后使用var $localFile="currencies_local.xml";（本地文件）代替..