user_guide_src/source/libraries/xmlrpc.rst - code-igniter-v3-giggi - Gitiles

 ##################################
 XML-RPC and XML-RPC Server Classes
 ##################################

 CodeIgniter's XML-RPC classes permit you to send requests to another
 server, or set up your own XML-RPC server to receive requests.

 ****************
 What is XML-RPC?
 ****************

 Quite simply it is a way for two computers to communicate over the
 internet using XML. One computer, which we will call the client, sends
 an XML-RPC **request** to another computer, which we will call the
 server. Once the server receives and processes the request it will send
 back a **response** to the client.

 For example, using the MetaWeblog API, an XML-RPC Client (usually a
 desktop publishing tool) will send a request to an XML-RPC Server
 running on your site. This request might be a new weblog entry being
 sent for publication, or it could be a request for an existing entry for
 editing. When the XML-RPC Server receives this request it will examine
 it to determine which class/method should be called to process the
 request. Once processed, the server will then send back a response
 message.

 For detailed specifications, you can visit the
 `XML-RPC <http://www.xmlrpc.com/>`_ site.

 Initializing the Class
 ======================

 Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes
 are initialized in your controller using the $this->load->library
 function:

 To load the XML-RPC class you will use::

 	$this->load->library('xmlrpc');

 Once loaded, the xml-rpc library object will be available using:
 $this->xmlrpc

 To load the XML-RPC Server class you will use::

 	 $this->load->library('xmlrpc'); $this->load->library('xmlrpcs');

 Once loaded, the xml-rpcs library object will be available using:
 $this->xmlrpcs

 .. note:: When using the XML-RPC Server class you must load BOTH the
 	XML-RPC class and the XML-RPC Server class.

 Sending XML-RPC Requests
 ========================

 To send a request to an XML-RPC server you must specify the following
 information:

 -  The URL of the server
 -  The method on the server you wish to call
 -  The *request* data (explained below).

 Here is a basic example that sends a simple Weblogs.com ping to the
 `Ping-o-Matic <http://pingomatic.com/>`_

 ::

 	$this->load->library('xmlrpc');  $this->xmlrpc->server('http://rpc.pingomatic.com/', 80); $this->xmlrpc->method('weblogUpdates.ping');   $request = array('My Photoblog', 'http://www.my-site.com/photoblog/'); $this->xmlrpc->request($request);  if ( ! $this->xmlrpc->send_request()) {     echo $this->xmlrpc->display_error(); }

 Explanation
 -----------

 The above code initializes the XML-RPC class, sets the server URL and
 method to be called (weblogUpdates.ping). The request (in this case, the
 title and URL of your site) is placed into an array for transportation,
 and compiled using the request() function. Lastly, the full request is
 sent. If the send_request() method returns false we will display the
 error message sent back from the XML-RPC Server.

 Anatomy of a Request
 ====================

 An XML-RPC request is simply the data you are sending to the XML-RPC
 server. Each piece of data in a request is referred to as a request
 parameter. The above example has two parameters: The URL and title of
 your site. When the XML-RPC server receives your request, it will look
 for parameters it requires.

 Request parameters must be placed into an array for transportation, and
 each parameter can be one of seven data types (strings, numbers, dates,
 etc.). If your parameters are something other than strings you will have
 to include the data type in the request array.

 Here is an example of a simple array with three parameters::

 	$request = array('John', 'Doe', 'www.some-site.com'); $this->xmlrpc->request($request);

 If you use data types other than strings, or if you have several
 different data types, you will place each parameter into its own array,
 with the data type in the second position::

 	 $request = array (                    array('John', 'string'),                    array('Doe', 'string'),                    array(FALSE, 'boolean'),                    array(12345, 'int')                  );  $this->xmlrpc->request($request);

 The `Data Types <#datatypes>`_ section below has a full list of data
 types.
 Creating an XML-RPC Server
 ==========================

 An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming
 requests and redirecting them to the appropriate functions for
 processing.

 To create your own XML-RPC server involves initializing the XML-RPC
 Server class in your controller where you expect the incoming request to
 appear, then setting up an array with mapping instructions so that
 incoming requests can be sent to the appropriate class and method for
 processing.

 Here is an example to illustrate::

 	 $this->load->library('xmlrpc'); $this->load->library('xmlrpcs');  $config['functions']['new_post'] = array('function' => 'My_blog.new_entry'), $config['functions']['update_post'] = array('function' => 'My_blog.update_entry'); $config['object'] = $this;  $this->xmlrpcs->initialize($config); $this->xmlrpcs->serve();

 The above example contains an array specifying two method requests that
 the Server allows. The allowed methods are on the left side of the
 array. When either of those are received, they will be mapped to the
 class and method on the right.

 The 'object' key is a special key that you pass an instantiated class
 object with, which is necessary when the method you are mapping to is
 not part of the CodeIgniter super object.

 In other words, if an XML-RPC Client sends a request for the new_post
 method, your server will load the My_blog class and call the new_entry
 function. If the request is for the update_post method, your server
 will load the My_blog class and call the update_entry function.

 The function names in the above example are arbitrary. You'll decide
 what they should be called on your server, or if you are using
 standardized APIs, like the Blogger or MetaWeblog API, you'll use their
 function names.

 There are two additional configuration keys you may make use of when
 initializing the server class: debug can be set to TRUE in order to
 enable debugging, and xss_clean may be set to FALSE to prevent sending
 data through the Security library's xss_clean function.

 Processing Server Requests
 ==========================

 When the XML-RPC Server receives a request and loads the class/method
 for processing, it will pass an object to that method containing the
 data sent by the client.

 Using the above example, if the new_post method is requested, the
 server will expect a class to exist with this prototype::

 	class My_blog extends CI_Controller {      function new_post($request)     {          } }

 The $request variable is an object compiled by the Server, which
 contains the data sent by the XML-RPC Client. Using this object you will
 have access to the *request parameters* enabling you to process the
 request. When you are done you will send a Response back to the Client.

 Below is a real-world example, using the Blogger API. One of the methods
 in the Blogger API is getUserInfo(). Using this method, an XML-RPC
 Client can send the Server a username and password, in return the Server
 sends back information about that particular user (nickname, user ID,
 email address, etc.). Here is how the processing function might look::

 	class My_blog extends CI_Controller {      function getUserInfo($request)     {          $username = 'smitty';         $password = 'secretsmittypass';          $this->load->library('xmlrpc');              $parameters = $request->output_parameters();              if ($parameters['1'] != $username AND $parameters['2'] != $password)         {             return $this->xmlrpc->send_error_message('100', 'Invalid Access');         }              $response = array(array('nickname'  => array('Smitty','string'),                                 'userid'    => array('99','string'),                                 'url'       => array('http://yoursite.com','string'),                                 'email'     => array('jsmith@yoursite.com','string'),                                 'lastname'  => array('Smith','string'),                                 'firstname' => array('John','string')                                 ),                          'struct');          return $this->xmlrpc->send_response($response);     } }

 Notes:
 ------

 The output_parameters() function retrieves an indexed array
 corresponding to the request parameters sent by the client. In the above
 example, the output parameters will be the username and password.

 If the username and password sent by the client were not valid, and
 error message is returned using send_error_message().

 If the operation was successful, the client will be sent back a response
 array containing the user's info.

 Formatting a Response
 =====================

 Similar to *Requests*, *Responses* must be formatted as an array.
 However, unlike requests, a response is an array **that contains a
 single item**. This item can be an array with several additional arrays,
 but there can be only one primary array index. In other words, the basic
 prototype is this::

 	$response = array('Response data',  'array');

 Responses, however, usually contain multiple pieces of information. In
 order to accomplish this we must put the response into its own array so
 that the primary array continues to contain a single piece of data.
 Here's an example showing how this might be accomplished::

 	 $response = array (                    array(                          'first_name' => array('John', 'string'),                          'last_name' => array('Doe', 'string'),                          'member_id' => array(123435, 'int'),                          'todo_list' => array(array('clean house', 'call mom', 'water plants'), 'array'),                         ),                  'struct'                  );

 Notice that the above array is formatted as a struct. This is the most
 common data type for responses.

 As with Requests, a response can be one of the seven data types listed
 in the `Data Types <#datatypes>`_ section.

 Sending an Error Response
 =========================

 If you need to send the client an error response you will use the
 following::

 	return $this->xmlrpc->send_error_message('123', 'Requested data not available');

 The first parameter is the error number while the second parameter is
 the error message.

 Creating Your Own Client and Server
 ===================================

 To help you understand everything we've covered thus far, let's create a
 couple controllers that act as XML-RPC Client and Server. You'll use the
 Client to send a request to the Server and receive a response.

 The Client
 ----------

 Using a text editor, create a controller called xmlrpc_client.php. In
 it, place this code and save it to your applications/controllers/
 folder:

 <?php class Xmlrpc_client extends CI_Controller { function index() {
 $this->load->helper('url'); $server_url = site_url('xmlrpc_server');
 $this->load->library('xmlrpc'); $this->xmlrpc->server($server_url, 80);
 $this->xmlrpc->method('Greetings'); $request = array('How is it
 going?'); $this->xmlrpc->request($request); if ( !
 $this->xmlrpc->send_request()) { echo $this->xmlrpc->display_error();
 } else { echo '
 ::

     ';
                 print_r($this->xmlrpc->display_response());
                 echo '

 '; } } } ?>
 Note: In the above code we are using a "url helper". You can find more
 information in the :doc:`Helpers Functions <../general/helpers>` page.

 The Server
 ----------

 Using a text editor, create a controller called xmlrpc_server.php. In
 it, place this code and save it to your applications/controllers/
 folder:

 <?php class Xmlrpc_server extends CI_Controller { function index() {
 $this->load->library('xmlrpc'); $this->load->library('xmlrpcs');
 $config['functions']['Greetings'] = array('function' =>
 'Xmlrpc_server.process'); $this->xmlrpcs->initialize($config);
 $this->xmlrpcs->serve(); } function process($request) { $parameters =
 $request->output_parameters(); $response = array( array( 'you_said' =>
 $parameters['0'], 'i_respond' => 'Not bad at all.'), 'struct'); return
 $this->xmlrpc->send_response($response); } } ?>
 Try it!
 -------

 Now visit the your site using a URL similar to this::

 	example.com/index.php/xmlrpc_client/

 You should now see the message you sent to the server, and its response
 back to you.

 The client you created sends a message ("How's is going?") to the
 server, along with a request for the "Greetings" method. The Server
 receives the request and maps it to the "process" function, where a
 response is sent back.

 Using Associative Arrays In a Request Parameter
 ===============================================

 If you wish to use an associative array in your method parameters you
 will need to use a struct datatype::

 	$request = array(                      array(                            // Param 0                            array(                                  'name'=>'John'                                     ),                                  'struct'                            ),                            array(                                  // Param 1                                  array(                                           'size'=>'large',                                        'shape'=>'round'                                           ),                                  'struct'                            )                      );     $this->xmlrpc->request($request);

 You can retrieve the associative array when processing the request in
 the Server.

 ::

 	$parameters = $request->output_parameters();     $name = $parameters['0']['name'];     $size = $parameters['1']['size'];     $size = $parameters['1']['shape'];

 **************************
 XML-RPC Function Reference
 **************************

 $this->xmlrpc->server()
 =======================

 Sets the URL and port number of the server to which a request is to be
 sent::

 	$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);

 $this->xmlrpc->timeout()
 ========================

 Set a time out period (in seconds) after which the request will be
 canceled::

 	$this->xmlrpc->timeout(6);

 $this->xmlrpc->method()
 =======================

 Sets the method that will be requested from the XML-RPC server::

 	$this->xmlrpc->method('method');

 Where method is the name of the method.

 $this->xmlrpc->request()
 ========================

 Takes an array of data and builds request to be sent to XML-RPC server::

 	$request = array(array('My Photoblog', 'string'), 'http://www.yoursite.com/photoblog/'); $this->xmlrpc->request($request);

 $this->xmlrpc->send_request()
 ==============================

 The request sending function. Returns boolean TRUE or FALSE based on
 success for failure, enabling it to be used conditionally.

 $this->xmlrpc->set_debug(TRUE);
 ================================

 Enables debugging, which will display a variety of information and error
 data helpful during development.

 $this->xmlrpc->display_error()
 ===============================

 Returns an error message as a string if your request failed for some
 reason.

 ::

 	echo $this->xmlrpc->display_error();

 $this->xmlrpc->display_response()
 ==================================

 Returns the response from the remote server once request is received.
 The response will typically be an associative array.

 ::

 	$this->xmlrpc->display_response();

 $this->xmlrpc->send_error_message()
 =====================================

 This function lets you send an error message from your server to the
 client. First parameter is the error number while the second parameter
 is the error message.

 ::

 	return $this->xmlrpc->send_error_message('123', 'Requested data not available');

 $this->xmlrpc->send_response()
 ===============================

 Lets you send the response from your server to the client. An array of
 valid data values must be sent with this method.

 ::

 	$response = array(                  array(                         'flerror' => array(FALSE, 'boolean'),                         'message' => "Thanks for the ping!"                      )                  'struct'); return $this->xmlrpc->send_response($response);

 Data Types
 ==========

 According to the `XML-RPC spec <http://www.xmlrpc.com/spec>`_ there are
 seven types of values that you can send via XML-RPC:

 -  *int* or *i4*
 -  *boolean*
 -  *string*
 -  *double*
 -  *dateTime.iso8601*
 -  *base64*
 -  *struct* (contains array of values)
 -  *array* (contains array of values)
	##################################
	XML-RPC and XML-RPC Server Classes
	##################################

	CodeIgniter's XML-RPC classes permit you to send requests to another
	server, or set up your own XML-RPC server to receive requests.

	****************
	What is XML-RPC?
	****************

	Quite simply it is a way for two computers to communicate over the
	internet using XML. One computer, which we will call the client, sends
	an XML-RPC request to another computer, which we will call the
	server. Once the server receives and processes the request it will send
	back a response to the client.

	For example, using the MetaWeblog API, an XML-RPC Client (usually a
	desktop publishing tool) will send a request to an XML-RPC Server
	running on your site. This request might be a new weblog entry being
	sent for publication, or it could be a request for an existing entry for
	editing. When the XML-RPC Server receives this request it will examine
	it to determine which class/method should be called to process the
	request. Once processed, the server will then send back a response
	message.

	For detailed specifications, you can visit the
	`XML-RPC <http://www.xmlrpc.com/>`_ site.

	Initializing the Class
	======================

	Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes
	are initialized in your controller using the $this->load->library
	function:

	To load the XML-RPC class you will use::

	$this->load->library('xmlrpc');

	Once loaded, the xml-rpc library object will be available using:
	$this->xmlrpc

	To load the XML-RPC Server class you will use::

	$this->load->library('xmlrpc'); $this->load->library('xmlrpcs');

	Once loaded, the xml-rpcs library object will be available using:
	$this->xmlrpcs

	.. note:: When using the XML-RPC Server class you must load BOTH the
	XML-RPC class and the XML-RPC Server class.

	Sending XML-RPC Requests
	========================

	To send a request to an XML-RPC server you must specify the following
	information:

	- The URL of the server
	- The method on the server you wish to call
	- The request data (explained below).

	Here is a basic example that sends a simple Weblogs.com ping to the
	`Ping-o-Matic <http://pingomatic.com/>`_

	::

	$this->load->library('xmlrpc'); $this->xmlrpc->server('http://rpc.pingomatic.com/', 80); $this->xmlrpc->method('weblogUpdates.ping'); $request = array('My Photoblog', 'http://www.my-site.com/photoblog/'); $this->xmlrpc->request($request); if ( ! $this->xmlrpc->send_request()) { echo $this->xmlrpc->display_error(); }

	Explanation
	-----------

	The above code initializes the XML-RPC class, sets the server URL and
	method to be called (weblogUpdates.ping). The request (in this case, the
	title and URL of your site) is placed into an array for transportation,
	and compiled using the request() function. Lastly, the full request is
	sent. If the send_request() method returns false we will display the
	error message sent back from the XML-RPC Server.

	Anatomy of a Request
	====================

	An XML-RPC request is simply the data you are sending to the XML-RPC
	server. Each piece of data in a request is referred to as a request
	parameter. The above example has two parameters: The URL and title of
	your site. When the XML-RPC server receives your request, it will look
	for parameters it requires.

	Request parameters must be placed into an array for transportation, and
	each parameter can be one of seven data types (strings, numbers, dates,
	etc.). If your parameters are something other than strings you will have
	to include the data type in the request array.

	Here is an example of a simple array with three parameters::

	$request = array('John', 'Doe', 'www.some-site.com'); $this->xmlrpc->request($request);

	If you use data types other than strings, or if you have several
	different data types, you will place each parameter into its own array,
	with the data type in the second position::

	$request = array ( array('John', 'string'), array('Doe', 'string'), array(FALSE, 'boolean'), array(12345, 'int') ); $this->xmlrpc->request($request);

	The `Data Types <#datatypes>`_ section below has a full list of data
	types.
	Creating an XML-RPC Server
	==========================

	An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming
	requests and redirecting them to the appropriate functions for
	processing.

	To create your own XML-RPC server involves initializing the XML-RPC
	Server class in your controller where you expect the incoming request to
	appear, then setting up an array with mapping instructions so that
	incoming requests can be sent to the appropriate class and method for
	processing.

	Here is an example to illustrate::

	$this->load->library('xmlrpc'); $this->load->library('xmlrpcs'); $config['functions']['new_post'] = array('function' => 'My_blog.new_entry'), $config['functions']['update_post'] = array('function' => 'My_blog.update_entry'); $config['object'] = $this; $this->xmlrpcs->initialize($config); $this->xmlrpcs->serve();

	The above example contains an array specifying two method requests that
	the Server allows. The allowed methods are on the left side of the
	array. When either of those are received, they will be mapped to the
	class and method on the right.

	The 'object' key is a special key that you pass an instantiated class
	object with, which is necessary when the method you are mapping to is
	not part of the CodeIgniter super object.

	In other words, if an XML-RPC Client sends a request for the new_post
	method, your server will load the My_blog class and call the new_entry
	function. If the request is for the update_post method, your server
	will load the My_blog class and call the update_entry function.

	The function names in the above example are arbitrary. You'll decide
	what they should be called on your server, or if you are using
	standardized APIs, like the Blogger or MetaWeblog API, you'll use their
	function names.

	There are two additional configuration keys you may make use of when
	initializing the server class: debug can be set to TRUE in order to
	enable debugging, and xss_clean may be set to FALSE to prevent sending
	data through the Security library's xss_clean function.

	Processing Server Requests
	==========================

	When the XML-RPC Server receives a request and loads the class/method
	for processing, it will pass an object to that method containing the
	data sent by the client.

	Using the above example, if the new_post method is requested, the
	server will expect a class to exist with this prototype::

	class My_blog extends CI_Controller { function new_post($request) { } }

	The $request variable is an object compiled by the Server, which
	contains the data sent by the XML-RPC Client. Using this object you will
	have access to the request parameters enabling you to process the
	request. When you are done you will send a Response back to the Client.

	Below is a real-world example, using the Blogger API. One of the methods
	in the Blogger API is getUserInfo(). Using this method, an XML-RPC
	Client can send the Server a username and password, in return the Server
	sends back information about that particular user (nickname, user ID,
	email address, etc.). Here is how the processing function might look::

	class My_blog extends CI_Controller { function getUserInfo($request) { $username = 'smitty'; $password = 'secretsmittypass'; $this->load->library('xmlrpc'); $parameters = $request->output_parameters(); if ($parameters['1'] != $username AND $parameters['2'] != $password) { return $this->xmlrpc->send_error_message('100', 'Invalid Access'); } $response = array(array('nickname' => array('Smitty','string'), 'userid' => array('99','string'), 'url' => array('http://yoursite.com','string'), 'email' => array('jsmith@yoursite.com','string'), 'lastname' => array('Smith','string'), 'firstname' => array('John','string') ), 'struct'); return $this->xmlrpc->send_response($response); } }

	Notes:
	------

	The output_parameters() function retrieves an indexed array
	corresponding to the request parameters sent by the client. In the above
	example, the output parameters will be the username and password.

	If the username and password sent by the client were not valid, and
	error message is returned using send_error_message().

	If the operation was successful, the client will be sent back a response
	array containing the user's info.

	Formatting a Response
	=====================

	Similar to Requests, Responses must be formatted as an array.
	However, unlike requests, a response is an array **that contains a
	single item**. This item can be an array with several additional arrays,
	but there can be only one primary array index. In other words, the basic
	prototype is this::

	$response = array('Response data', 'array');

	Responses, however, usually contain multiple pieces of information. In
	order to accomplish this we must put the response into its own array so
	that the primary array continues to contain a single piece of data.
	Here's an example showing how this might be accomplished::

	$response = array ( array( 'first_name' => array('John', 'string'), 'last_name' => array('Doe', 'string'), 'member_id' => array(123435, 'int'), 'todo_list' => array(array('clean house', 'call mom', 'water plants'), 'array'), ), 'struct' );

	Notice that the above array is formatted as a struct. This is the most
	common data type for responses.

	As with Requests, a response can be one of the seven data types listed
	in the `Data Types <#datatypes>`_ section.

	Sending an Error Response
	=========================

	If you need to send the client an error response you will use the
	following::

	return $this->xmlrpc->send_error_message('123', 'Requested data not available');

	The first parameter is the error number while the second parameter is
	the error message.

	Creating Your Own Client and Server
	===================================

	To help you understand everything we've covered thus far, let's create a
	couple controllers that act as XML-RPC Client and Server. You'll use the
	Client to send a request to the Server and receive a response.

	The Client
	----------

	Using a text editor, create a controller called xmlrpc_client.php. In
	it, place this code and save it to your applications/controllers/
	folder:

	<?php class Xmlrpc_client extends CI_Controller { function index() {
	$this->load->helper('url'); $server_url = site_url('xmlrpc_server');
	$this->load->library('xmlrpc'); $this->xmlrpc->server($server_url, 80);
	$this->xmlrpc->method('Greetings'); $request = array('How is it
	going?'); $this->xmlrpc->request($request); if ( !
	$this->xmlrpc->send_request()) { echo $this->xmlrpc->display_error();
	} else { echo '
	::

	';
	print_r($this->xmlrpc->display_response());
	echo '

	'; } } } ?>
	Note: In the above code we are using a "url helper". You can find more
	information in the :doc:`Helpers Functions <../general/helpers>` page.

	The Server
	----------

	Using a text editor, create a controller called xmlrpc_server.php. In
	it, place this code and save it to your applications/controllers/
	folder:

	<?php class Xmlrpc_server extends CI_Controller { function index() {
	$this->load->library('xmlrpc'); $this->load->library('xmlrpcs');
	$config['functions']['Greetings'] = array('function' =>
	'Xmlrpc_server.process'); $this->xmlrpcs->initialize($config);
	$this->xmlrpcs->serve(); } function process($request) { $parameters =
	$request->output_parameters(); $response = array( array( 'you_said' =>
	$parameters['0'], 'i_respond' => 'Not bad at all.'), 'struct'); return
	$this->xmlrpc->send_response($response); } } ?>
	Try it!
	-------

	Now visit the your site using a URL similar to this::

	example.com/index.php/xmlrpc_client/

	You should now see the message you sent to the server, and its response
	back to you.

	The client you created sends a message ("How's is going?") to the
	server, along with a request for the "Greetings" method. The Server
	receives the request and maps it to the "process" function, where a
	response is sent back.

	Using Associative Arrays In a Request Parameter
	===============================================

	If you wish to use an associative array in your method parameters you
	will need to use a struct datatype::

	$request = array( array( // Param 0 array( 'name'=>'John' ), 'struct' ), array( // Param 1 array( 'size'=>'large', 'shape'=>'round' ), 'struct' ) ); $this->xmlrpc->request($request);

	You can retrieve the associative array when processing the request in
	the Server.

	::

	$parameters = $request->output_parameters(); $name = $parameters['0']['name']; $size = $parameters['1']['size']; $size = $parameters['1']['shape'];

	**************************
	XML-RPC Function Reference
	**************************

	$this->xmlrpc->server()
	=======================

	Sets the URL and port number of the server to which a request is to be
	sent::

	$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);

	$this->xmlrpc->timeout()
	========================

	Set a time out period (in seconds) after which the request will be
	canceled::

	$this->xmlrpc->timeout(6);

	$this->xmlrpc->method()
	=======================

	Sets the method that will be requested from the XML-RPC server::

	$this->xmlrpc->method('method');

	Where method is the name of the method.

	$this->xmlrpc->request()
	========================

	Takes an array of data and builds request to be sent to XML-RPC server::

	$request = array(array('My Photoblog', 'string'), 'http://www.yoursite.com/photoblog/'); $this->xmlrpc->request($request);

	$this->xmlrpc->send_request()
	==============================

	The request sending function. Returns boolean TRUE or FALSE based on
	success for failure, enabling it to be used conditionally.

	$this->xmlrpc->set_debug(TRUE);
	================================

	Enables debugging, which will display a variety of information and error
	data helpful during development.

	$this->xmlrpc->display_error()
	===============================

	Returns an error message as a string if your request failed for some
	reason.

	::

	echo $this->xmlrpc->display_error();

	$this->xmlrpc->display_response()
	==================================

	Returns the response from the remote server once request is received.
	The response will typically be an associative array.

	::

	$this->xmlrpc->display_response();

	$this->xmlrpc->send_error_message()
	=====================================

	This function lets you send an error message from your server to the
	client. First parameter is the error number while the second parameter
	is the error message.

	::

	return $this->xmlrpc->send_error_message('123', 'Requested data not available');

	$this->xmlrpc->send_response()
	===============================

	Lets you send the response from your server to the client. An array of
	valid data values must be sent with this method.

	::

	$response = array( array( 'flerror' => array(FALSE, 'boolean'), 'message' => "Thanks for the ping!" ) 'struct'); return $this->xmlrpc->send_response($response);

	Data Types
	==========

	According to the `XML-RPC spec <http://www.xmlrpc.com/spec>`_ there are
	seven types of values that you can send via XML-RPC:

	- int or i4
	- boolean
	- string
	- double
	- dateTime.iso8601
	- base64
	- struct (contains array of values)
	- array (contains array of values)