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  Classes of Cristian Navalici  >  XML Currency Reader  >  info.txt  >  Download  
File: info.txt
Role: Documentation
Content type: text/plain
Description: Additional info
Class: XML Currency Reader
Retrieve currency exchange data from XML files
Author: By
Last change: Added information about how to extend the base class.
Date: 14 years ago
Size: 3,058 bytes


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============================================== XML Currency Reader class ============================================== This class implements support for xml currencies files, usually provided by central banks. It's a general class, who must be extended with particulary classes (e.g. BNR_reader.class) abstract class XML_currency Variables: abstract protected function parse_rate_contents($content, $currency = 'EUR'); abstract protected function parse_domdoc(); protected $xmlpath protected $allow_url_fopen; protected $xml_content; protected $domdoc Methods: public function __construct() public function parse_xml() protected function get_xml_content() protected function DOMconnector() ---------------------------------------- class BNR_reader extends XML_currency Variables: inherited ones protected $xmlpathl => here the URL for xml file Methods: inherited ones public function parse_rate_contents($content, $currency = 'EUR') public function parse_domdoc() ============================================== USAGE FOR BNR READER CLASS: ============================================== Usage is very simple, just call parse_xml method on a class object, and then display on your page the needed value. More on index.php. ============================================== XML FILE: ============================================== ============================================== RETURNING ARRAY FORMAT: ============================================== Array ( [0] => National Bank of Romania [1] => 2008-10-24 [2] => Array ( [0] => Array ( [currency] => AUD [rate] => 1.8022 [multiplier] => 1 ) [1] => Array ( [currency] => BGN [rate] => 1.8854 [multiplier] => 1 ) ... [19] => Array ( [currency] => XAU [rate] => 65.5854 [multiplier] => 1 ) [20] => Array ( [currency] => XDR [rate] => 4.2963 [multiplier] => 1 ) ) ) ============================================== HOW TO EXTEND THE XML_CURRENCY_READER CLASS ============================================== This is very simple. Just create a class who extends the XML_Currency_reader.class and add some content to $xmlpath (the xml file URL), and also two particulary methods: parse_domdoc - who parse the xml content and returns it in your specified form (depends on the xml structure) parse_rate_contents - (optional) method used to retrieve a currency from parsed content. You can also use a direct array approach, but this methods makes it more intuitive.