php currency slows page - php

Question

I have a page whit ads, and i set the page currency in "RON" and i convert to show also in "Euro" but in the loop is very slow.. I tried to include the script form other php but stil the same... I tried many currency changer but all have the same problem.. slow the page down.. and if i put the code directly in to the loop then tells me an error: that the class could not be repeated.
here is the php currency what i used:
<?php
class cursBnrXML
{
var $currency = array();
function cursBnrXML($url)
{
$this->xmlDocument = file_get_contents($url);
$this->parseXMLDocument();
}
function parseXMLDocument()
{
$xml = new SimpleXMLElement($this->xmlDocument);
$this->date=$xml->Header->PublishingDate;
foreach($xml->Body->Cube->Rate as $line)
{
$this->currency[]=array("name"=>$line["currency"], "value"=>$line, "multiplier"=>$line["multiplier"]);
}
}
function getCurs($currency)
{
foreach($this->currency as $line)
{
if($line["name"]==$currency)
{
return $line["value"];
}
}
return "Incorrect currency!";
}
}
//#an example of using the cursBnrXML class
$curs=new cursBnrXML("http://www.bnr.ro/nbrfxrates.xml");
?>

Answer 1

You can modify the cursBnrXML class to cache parsed currency so that you do not have to loop over entire collection again each look up.
<?php
class cursBnrXML
{
private $_currency = array();
# keep the constructor the same
# modify this method
function parseXMLDocument()
{
$xml = new SimpleXMLElement($this->xmlDocument);
$this->date=$xml->Header->PublishingDate;
foreach($xml->Body->Cube->Rate as $line)
{
$this->currency[$line["currency"]]=array(
"value"=>$line,
"multiplier"=>$line["multiplier"]
);
}
}
# modify this method too
function getCurs($currency)
{
if (isset($this->_currency[$currency]))
{
return $this->_currency[$currency]['value'];
}
return "Incorrect currency!";
}
}
//#an example of using the cursBnrXML class
$curs=new cursBnrXML("http://www.bnr.ro/nbrfxrates.xml");
?>