<?php
/**
* LICENSE
* -------------------
* Copyright (c) 2007-2009, Kaiser Shahid <knitcore@yahoo.com> and
* Campaign Monitor <support@campaignmonitor.com>
* All rights reserved.
*
* This software is licensed under the BSD License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of Kaiser Shahid or Campaign Monitor nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Kaiser Shahid "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Kaiser Shahid BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @package CampaignMonitorLib
*/
/**
* This is an all-inclusive package for interfacing with Campaign Monitor's services. It
* supports SOAP, GET, and POST seamlessly (just set the $method property to 'soap', 'get', 
* or 'post' before making a call) and always returns the same view of data regardless of
* the method used to call the service.
*
* See README for more information on usage and details.
*
* CHANGES: 2008-04-28
* -------------------
* - Now compatible with PHP4. Biggest changes include removing reliance on
*   enhanced OOP syntax, and using XML Parser functions instead of SimpleXML.
* - Base class (CMBase) branches into CampaignMonitor and MailBuild
* - CMBase contains all the shared API calls (and extended functionality 
*   related to those) between both classes.
*
* @package CampaignMonitorLib
* @subpackage CMBase
* @author Kaiser Shahid <knitcore@yahoo.com> (www.qaiser.net)
* @copyright 2007-2009
* @see http://www.campaignmonitor.com/api/
*/
define('PHPVER', phpversion());
define('CM_PHP_WRAPPER_VERSION', '1.4.9');
// WARNING: this is needed to keep the socket from apparently hanging (even when it should be done reading)
// NOTE: using a timeout (SOCKET_TIMEOUT) that's passed when calling fsockopen. safer thing to do.
//ini_set( 'default_socket_timeout', 1 );
define( 'SOCKET_TIMEOUT', 1 );
class CMBase
{
    var /*@ protected */
        $api = ''
        , $campaign_id = 0
        , $client_id = 0
        , $list_id = 0
    ;
    
    var /*@ public */
        $method = 'get'
        , $url = ''
        , $soapAction = ''
        , $curl = true
        , $curlExists = true
    ;
    
    // debugging options
    var /*@ public */
        $debug_level = 0
        , $debug_request = ''
        , $debug_response = ''
        , $debug_url = ''
        , $debug_info = array()
        , $show_response_headers = 0
    ;
    
    /**
    * @param string $api Your API key.
    * @param string $client The default ClientId you're going to work with.
    * @param string $campaign The default CampaignId you're going to work with.
    * @param string $list The default ListId you're going to work with.
    * @param string $method Determines request type. Values are either get, post, or soap.
    */
    function __construct( $api = null, $client = null, $campaign = null, $list = null, $method = 'get' )
    {
        $this->api = $api;
        $this->client_id = $client;
        $this->campaign_id = $campaign;
        $this->list_id = $list;
        $this->method = $method;
        $this->curlExists = function_exists( 'curl_init' ) && function_exists( 'curl_setopt' );
    }
    /**
    * The direct way to make an API call. This allows developers to include new API
    * methods that might not yet have a wrapper method as part of the package.
    *
    * @param string $action The API call.
    * @param array $options An associative array of values to send as part of the request.
    * @return array The parsed XML of the request.
    */
    function makeCall( $action = '', $options = array() )
    {
        // NEW [2008-06-24]: switch to soap automatically for these calls
        $old_method = $this->method;
        if ( $action == 'Subscriber.AddWithCustomFields' || $action == 'Subscriber.AddAndResubscribeWithCustomFields' || $action == 'Campaign.Create')
            $this->method = 'soap';
        
        if ( !$action ) return null;
        $url = $this->url;
        
        // DONE: like facebook's client, allow for get/post through the file wrappers
        // if curl isn't available. (or maybe have curl-emulating functions defined 
        // at the bottom of this script.)
        
        //$ch = curl_init();
        if ( !isset( $options['header'] ) )
            $options['header'] = array();
        
        $options['header'][] = 'User-Agent: CMBase URL Handler ' . CM_PHP_WRAPPER_VERSION;
        
        $postdata = '';
        $method = 'GET';
        
        if ( $this->method == 'soap' )
        {
            $options['header'][] = 'Content-Type: text/xml; charset=utf-8';
            $options['header'][] = 'SOAPAction: "' . $this->soapAction . $action . '"';
            
            $postdata = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
            $postdata .= "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"";
            $postdata .= " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"";
            $postdata .= " xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n";
            $postdata .= "<soap:Body>\n";
            $postdata .= "  <{$action} xmlns=\"{$this->soapAction}\">\n";
            $postdata .= "      <ApiKey>{$this->api}</ApiKey>\n";
            
            if ( isset( $options['params'] ) )
                $postdata .= $this->array2xml( $options['params'], "\t\t" );
            
            $postdata .= "  </{$action}>\n";
            $postdata .= "</soap:Body>\n";
            $postdata .= "</soap:Envelope>";
            
            $method = 'POST';
            
            //curl_setopt( $ch, CURLOPT_POST, 1 );
            //curl_setopt( $ch, CURLOPT_POSTFIELDS, $postdata );
        }
        else
        {
            $postdata = "ApiKey={$this->api}";
            $url .= "/{$action}";
            
            // NOTE: since this is GET, the assumption is that params is a set of simple key-value pairs.
            if ( isset( $options['params'] ) )
            {
                foreach ( $options['params'] as $k => $v )
                    $postdata .= '&' . $k . '=' .rawurlencode($this->fixEncoding($v));
            }
            
            if ( $this->method == 'get' )
            {
                $url .= '?' . $postdata;
                $postdata = '';
            }
            else
            {
                $options['header'][] = 'Content-Type: application/x-www-form-urlencoded';
                $method = 'POST';
                //curl_setopt( $ch, CURLOPT_POST, 1 );
                //curl_setopt( $ch, CURLOPT_POSTFIELDS, $postdata );
            }
        }
                    
        $res = '';
        
        // WARNING: using fopen() does not recognize stream contexts in PHP 4.x, so
        // my guess is using fopen() in PHP 4.x implies that POST is not supported
        // (otherwise, how do you tell fopen() to use POST?). tried fsockopen(), but
        // response time was terrible. if someone has more experience with working
        // directly with streams, please troubleshoot that.
        // NOTE: fsockopen() needs a small timeout to force the socket to close.
        // it's defined in SOCKET_TIMEOUT. 
        
        // preferred method is curl, only if it exists and $this->curl is true.
        if ( $this->curl && $this->curlExists )
        {
            $ch = curl_init();
            if ( $this->method != 'get' )
            {
                curl_setopt( $ch, CURLOPT_POST, 1 );
                curl_setopt( $ch, CURLOPT_POSTFIELDS, $postdata );
            }
            
            curl_setopt( $ch, CURLOPT_URL, $url );
            curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
            curl_setopt( $ch, CURLOPT_HTTPHEADER, $options['header'] );
            curl_setopt( $ch, CURLOPT_HEADER, $this->show_response_headers );
            
            // except for the response, all other information will be stored when debugging is on.
            $res = curl_exec( $ch );
            if ( $this->debug_level )
            {
                $this->debug_url = $url;
                $this->debug_request = $postdata;
                $this->debug_info = curl_getinfo( $ch );
                $this->debug_info['headers_sent'] = $options['header'];
            }
            $this->debug_response = $res;
            curl_close( $ch );
        }
        else
        {
            // 'header' is actually the entire HTTP payload. as such, you need
            // Content-Length header, otherwise you'll get errors returned/emitted.
            
            $postLen = strlen( $postdata );
            $ctx = array(
                'method' => $method
                , 'header' => implode( "\n", $options['header'] ) 
                    . "\nContent-Length: " . $postLen
                    . "\n\n" . $postdata
            );
            
            if ( $this->debug_level )
            {
                $this->debug_url = $url;
                $this->debug_request = $postdata;
                $this->debug_info['overview'] = 'Used stream_context_create()/fopen() to make request. Content length=' . $postLen;
                $this->debug_info['headers_sent'] = $options['header'];
                //$this->debug_info['complete_content'] = $ctx;
            }
            
            $pv = PHPVER;
            
            // the preferred non-cURL way if user is using PHP 5.x
            if ( $pv{0} == '5' )
            {
                $context = stream_context_create( array( 'http' => $ctx ) );
                $fp = fopen( $url, 'r', false, $context );
                ob_start();
                fpassthru( $fp );
                fclose( $fp );
                $res = ob_get_clean();
            }
            else
            {
                // this should work with PHP 4, but it seems to take forever to get data back this way
                // NOTE: setting the default_socket_timeout seems to alleviate this issue [finally].
                list( $protocol, $url ) = explode( '//', $url, 2 );
                list( $domain, $path ) = explode( '/', $url, 2 );
                $fp = fsockopen( $domain, 80, $tvar, $tvar2, SOCKET_TIMEOUT );
            
                if ( $fp )
                {
                    $payload = "$method /$path HTTP/1.1\n"
                        . "Host: $domain\n"
                        . $ctx['header']
                    ;
                    fwrite( $fp, $payload );
                
                    // even with the socket timeout set, using fgets() isn't playing nice, but
                    // fpassthru() seems to be doing the right thing.
                
                    ob_start();
                    fpassthru( $fp );
                    list( $headers, $res ) = explode( "\r\n\r\n", ob_get_clean(), 2 );
                
                    if ( $this->debug_level )
                        $this->debug_info['headers_received'] = $headers;
                
                    fclose( $fp );
                }
                elseif ( $this->debug_level )
                    $this->debug_info['overview'] .= "\nOpening $domain/$path failed!";
            }
        }
        
        if ( $res )
        {
            if ( $this->method == 'soap' )
            {
                $tmp = $this->xml2array( $res, '/soap:Envelope/soap:Body' );
                if ( !is_array( $tmp ) )
                    return $tmp;
                else
                    return $tmp[$action.'Response'][$action.'Result'];
            }
            else
                return $this->xml2array($res);
        }
        else
            return null;
    }
    /**
     * Encodes a string to UTF-8 only if needed 
     * @param $in_str String to potentially encode
     * @return UTF-8 encoded string
     */
    function fixEncoding($in_str) { 
        $cur_encoding = mb_detect_encoding($in_str);
        if($cur_encoding == "UTF-8" && mb_check_encoding($in_str,"UTF-8"))
            return $in_str; 
        else 
            return utf8_encode($in_str);
    }
    /**
     * Convert the given XML $contents into a PHP array. Based on code from:
     * http://www.bin-co.com/php/scripts/xml2array/
     * @param $contents The XML to be converted.
     * @param $root The path of the root element within the XML at which 
     * conversion should occur.
     * @param $charset The character set to use.
     * @param $get_attributes 0 or 1. If this is 1 the function will get the 
     * attributes as well as the tag values - this results in a different array 
     * structure in the return value.
     * @param $priority Can be 'tag' or 'attribute'. This will change the structure
     * of the resulting array. For 'tag', the tags are given more importance.
     * @return A PHP array representing the XML $contents passed in
     */
    function xml2array(
        $contents, 
        $root = '/',
        $charset = 'utf-8',
        $get_attributes = 0, 
        $priority = 'tag') {
    
        if(!$contents)
            return array();
    
        if(!function_exists('xml_parser_create'))
            return array();
    
        // Get the PHP XML parser
        $parser = xml_parser_create($charset);
    
        // Attempt to find the last tag in the $root path and use this as the 
        // start/end tag for the process of extracting the xml
        // Example input: '/soap:Envelope/soap:Body'
    
        // Toggles whether the extraction of xml into the array actually occurs
        $extract_on = TRUE;
        $start_and_end_element_name = '';
        $root_elements = explode('/', $root);
        if ($root_elements != FALSE && 
            !empty($root_elements)) {
            $start_and_end_element_name = trim(end($root_elements));
            if (!empty($start_and_end_element_name))
                $extract_on = FALSE;
        }
    
        xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); # http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
        xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
        xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
        xml_parse_into_struct($parser, trim($contents), $xml_values);
        xml_parser_free($parser);
    
        if(!$xml_values) 
            return;
    
        $xml_array = array();
        $parents = array();
        $opened_tags = array();
        $arr = array();
    
        $current = &$xml_array; // Reference
    
        // Go through the tags.
        $repeated_tag_index = array(); // Multiple tags with same name will be turned into an array
        foreach($xml_values as $data) {
            unset($attributes,$value); // Remove existing values, or there will be trouble
    
            // This command will extract these variables into the foreach scope
            // tag(string), type(string), level(int), attributes(array).
            extract($data);
    
            if (!empty($start_and_end_element_name) && 
                $tag == $start_and_end_element_name) {
                // Start at the next element (if looking at the opening tag), 
                // or don't process any more elements (if looking at the closing tag)...
                $extract_on = !$extract_on;
                continue;
            }
    
            if (!$extract_on)
                continue;
            
            $result = array();
            $attributes_data = array();
            
            if(isset($value)) {
                if($priority == 'tag') $result = $value;
                else $result['value'] = $value; //Put the value in a assoc array if we are in the 'Attribute' mode
            }
    
            // Set the attributes too.
            if(isset($attributes) and $get_attributes) {
                foreach($attributes as $attr => $val) {
                    if($priority == 'tag') $attributes_data[$attr] = $val;
                    else $result['attr'][$attr] = $val; // Set all the attributes in a array called 'attr'
                }
            }
    
            // See tag status and do the needed.
            if($type == "open") {// The starting of the tag '<tag>'
                $parent[$level-1] = &$current;
                if(!is_array($current) or (!in_array($tag, array_keys($current)))) { //Insert New tag
                    $current[$tag] = $result;
                    if($attributes_data) $current[$tag. '_attr'] = $attributes_data;
                    $repeated_tag_index[$tag.'_'.$level] = 1;
                    $current = &$current[$tag];
                } else { // There was another element with the same tag name
                    if(isset($current[$tag][0])) { // If there is a 0th element it is already an array
                        $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
                        $repeated_tag_index[$tag.'_'.$level]++;
                    } else { // This section will make the value an array if multiple tags with the same name appear together
                        $current[$tag] = array($current[$tag],$result); // This will combine the existing item and the new item together to make an array
                        $repeated_tag_index[$tag.'_'.$level] = 2;
                        
                        if(isset($current[$tag.'_attr'])) { // The attribute of the last(0th) tag must be moved as well
                            $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                            unset($current[$tag.'_attr']);
                        }
                    }
                    $last_item_index = $repeated_tag_index[$tag.'_'.$level]-1;
                    $current = &$current[$tag][$last_item_index];
                }
            } elseif($type == "complete") { // Tags that ends in 1 line '<tag />'
                // See if the key is already taken.
                if(!isset($current[$tag])) { //New Key
                    // Don't insert an empty array - we don't want it!
                    if (!(is_array($result) && empty($result)))
                        $current[$tag] = $result;
                    $repeated_tag_index[$tag.'_'.$level] = 1;
                    if($priority == 'tag' and $attributes_data) $current[$tag. '_attr'] = $attributes_data;
    
                } else { // If taken, put all things inside a list(array)
                    if(isset($current[$tag][0]) and is_array($current[$tag])) { // If it is already an array...
    
                        // ...push the new element into that array.
                        $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
                        
                        if($priority == 'tag' and $get_attributes and $attributes_data) {
                            $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                        }
                        $repeated_tag_index[$tag.'_'.$level]++;
    
                    } else { // If it is not an array...
                        $current[$tag] = array($current[$tag],$result); // ...Make it an array using using the existing value and the new value
                        $repeated_tag_index[$tag.'_'.$level] = 1;
                        if($priority == 'tag' and $get_attributes) {
                            if(isset($current[$tag.'_attr'])) { // The attribute of the last(0th) tag must be moved as well
                                
                                $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                                unset($current[$tag.'_attr']);
                            }
                            
                            if($attributes_data) {
                                $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                            }
                        }
                        $repeated_tag_index[$tag.'_'.$level]++; // 0 and 1 index is already taken
                    }
                }
            } elseif($type == 'close') { // End of tag '</tag>'
                $current = &$parent[$level-1];
            }
        }
        return($xml_array);
    }  
    /**
    * Converts an array to XML. This is the inverse to xml2array(). Values
    * are automatically escaped with htmlentities(), so you don't need to escape 
    * values ahead of time. If you have, just set the third parameter to false.
    * This is an all-or-nothing deal.
    *
    * @param mixed $arr The associative to convert to an XML fragment
    * @param string $indent (Optional) Starting identation of each element
    * @param string $escape (Optional) Determines whether or not to escape a text node.
    * @return string An XML fragment.
    */
    function array2xml( $arr, $indent = '', $escape = true )
    {
        $buff = '';
        
        foreach ( $arr as $k => $v )
        {
            // Dreamweaver has a bug which causes "/" to be stripped out of "</$k>"
            // when editing PHP files, so variable parsing is not longer being used
            // where a forward slash is required before the variable
            if ( !is_array( $v ) )
                $buff .= "$indent<$k>" . ($escape ? $this->fixEncoding(htmlspecialchars($v)) : $v ) . "</" . $k . ">\n";
            else
            {
                /*
                Encountered a list. The primary difference between the two branches is that
                in the 'if' branch, a $k element is generated for each item in $v, whereas
                in the 'else' branch, a single $k element encapsulates $v.
                */
                
                if ( isset( $v[0] ) )
                {
                    foreach ( $v as $_k => $_v )
                    {
                        if ( is_array( $_v ) )
                            $buff .= "$indent<$k>\n" . $this->array2xml( $_v, $indent . "\t", $escape ) . "$indent</" . $k . ">\n";
                        else
                            $buff .= "$indent<$k>" . ($escape ? $this->fixEncoding(htmlspecialchars($_v)) : $_v ) . "</" . $k . ">\n";
                    }
                }
                else
                    $buff .= "$indent<$k>\n" . $this->array2xml( $v, $indent . "\t", $escape ) . "$indent</" . $k .">\n";
            }
        }
        
        return $buff;
    }
}   
/**
* The new CampaignMonitor class that now extends from CMBase. This should be 
* backwards compatible with the original (PHP5) version.
*
* @package CampaignMonitorLib
* @subpackage CampaignMonitor
* @author Kaiser Shahid <knitcore@yahoo.com> (www.qaiser.net) and 
* Campaign Monitor <support@campaignmonitor.com> 
* @copyright 2007-2009
* @see http://www.campaignmonitor.com/api/
*/
class CampaignMonitor extends CMBase
{
    var /*@ protected */
        $url = 'http://api.createsend.com/api/api.asmx',
        $soapAction = 'http://api.createsend.com/api/';
    
    /**
    * @param string $api Your API key.
    * @param string $client The default ClientId you're going to work with.
    * @param string $campaign The default CampaignId you're going to work with.
    * @param string $list The default ListId you're going to work with.
    * @param string $method Determines request type. Values are either get, post, or soap.
    */
    
    function __construct( $api = null, $client = null, $campaign = null, $list = null, $method = 'get' )
    {
        CMBase::__construct( $api, $client, $campaign, $list, $method );
    }
    /**
    * Wrapper for Subscribers.GetActive. This method triples as Subscribers.GetUnsubscribed 
    * and Subscribers.GetBounced when the very last parameter is overridden.
    *
    * @param mixed $date If a string, should be in the date() format of 'Y-m-d H:i:s', otherwise, a Unix timestamp.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @param string $action (Optional) Set the actual API method to call. Defaults to Subscribers.GeActive if no other valid value is given.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Subscribers.GetActive.aspx
    */
    function subscribersGetActive( $date  = 0, $list_id = null, $action = 'Subscribers.GetActive' )
    {
        if ( !$list_id )
            $list_id = $this->list_id;
        
        if ( is_numeric( $date ) )
            $date = date( 'Y-m-d H:i:s', $date );
        
        $valid_actions = array( 'Subscribers.GetActive' => '', 'Subscribers.GetUnsubscribed' => '', 'Subscribers.GetBounced' => '' );
        if ( !isset( $valid_actions[$action] ) )
            $action = 'Subscribers.GetActive';
        
        return $this->makeCall( $action
            , array( 
                'params' => array( 
                    'ListID' => $list_id 
                    , 'Date' => $date
                )
            )
        );
    }
    
    /**
    * @param mixed $date If a string, should be in the date() format of 'Y-m-d H:i:s', otherwise, a Unix timestamp.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @see http://www.campaignmonitor.com/api/Subscribers.GetUnsubscribed.aspx
    */
    function subscribersGetUnsubscribed( $date  = 0, $list_id = null )
    {
        return $this->subscribersGetActive( $date, $list_id, 'Subscribers.GetUnsubscribed' );
    }
    
    /**
    * @param mixed $date If a string, should be in the date() format of 'Y-m-d H:i:s', otherwise, a Unix timestamp.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @see http://www.campaignmonitor.com/api/Subscribers.GetBounced.aspx
    */
    function subscribersGetBounced( $date  = 0, $list_id = null )
    {
        return $this->subscribersGetActive( $date, $list_id, 'Subscribers.GetBounced' );
    }
    
    /**
    * subscriberAdd()
    * @param string $email Email address.
    * @param string $name User's name.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @param boolean $resubscribe If true, does an equivalent 'AndResubscribe' API method.
    * @see http://www.campaignmonitor.com/api/Subscriber.Add.aspx
    */
    function subscriberAdd( $email, $name, $list_id = null, $resubscribe = false )
    {
        if ( !$list_id )
            $list_id = $this->list_id;
        
        $action = 'Subscriber.Add';
        if ( $resubscribe ) $action = 'Subscriber.AddAndResubscribe';
        
        return $this->makeCall( $action
            , array(
                'params' => array(
                    'ListID' => $list_id
                    , 'Email' => $email
                    , 'Name' => $name
                )
            )
        );
    }
    
    /**
    * This encapsulates the check of whether this particular user unsubscribed once.
    * @param string $email Email address.
    * @param string $name User's name.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    */
    function subscriberAddRedundant( $email, $name, $list_id = null )
    {
        $added = $this->subscriberAdd( $email, $name, $list_id );        
            
        if ( $added && $added['Result']['Code'] == '204' )
        {
            $subscribed = $this->subscribersGetIsSubscribed( $email, $list_id );    
        
            // Must have unsubscribed, so resubscribe
            if ( $subscribed['anyType'] == 'False' )
            {
                // since we're internal, we'll just call the method with full parameters rather
                // than go through a secondary wrapper function.
                $added = $this->subscriberAdd( $email, $name, $list_id, true );
                return $added;
            }
        }
        
        return $added;
    }
    
    /**
    * @param string $email Email address.
    * @param string $name User's name.
    * @param mixed $fields Should be a $key => $value mapping. If there are more than one items for $key, let
    *        $value be a list of scalar values. Example: array( 'Interests' => array( 'xbox', 'wii' ) )
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @param boolean $resubscribe If true, does an equivalent 'AndResubscribe' API method.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Subscriber.AddWithCustomFields.aspx
    */
    function subscriberAddWithCustomFields( $email, $name, $fields, $list_id = null, $resubscribe = false )
    {
        if ( !$list_id )
            $list_id = $this->list_id;
        
        $action = 'Subscriber.AddWithCustomFields';
        if ( $resubscribe ) $action = 'Subscriber.AddAndResubscribeWithCustomFields';
        
        if ( !is_array( $fields ) )
            $fields = array();
        
        $_fields = array( 'SubscriberCustomField' => array() );
        foreach ( $fields as $k => $v )
        {
            if ( is_array( $v ) )
            {
                foreach ( $v as $nv )
                    $_fields['SubscriberCustomField'][] = array( 'Key' => $k, 'Value' => $nv );
            }
            else
                $_fields['SubscriberCustomField'][] = array( 'Key' => $k, 'Value' => $v );
        }
        return $this->makeCall( $action
            , array(
                'params' => array(
                    'ListID' => $list_id
                    , 'Email' => $email
                    , 'Name' => $name
                    , 'CustomFields' => $_fields
                )
            )
        );
    }
    
    /**
    * Same as subscriberAddRedundant() except with CustomFields.
    *
    * @param string $email Email address.
    * @param string $name User's name.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    */
    function subscriberAddWithCustomFieldsRedundant( $email, $name, $fields, $list_id = null )
    {
        $added = $this->subscriberAddWithCustomFields( $email, $name, $fields, $list_id );
        if ( $added && $added['Code'] == '0' )
        {
            $subscribed = $this->subscribersGetIsSubscribed( $email );
            if ( $subscribed == 'False' )
            {
                $added = $this->subscriberAddWithCustomFields( $email, $name, $fields, $list_id, true );
                return $added;
            }
        }
        
        return $added;
    }
    
    /**
    * @param string $email Email address.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @param boolean $check_subscribed If true, does the Subscribers.GetIsSubscribed API method instead.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Subscriber.Unsubscribe.aspx
    */
    function subscriberUnsubscribe( $email, $list_id = null, $check_subscribed = false )
    {
        if ( !$list_id )
            $list_id = $this->list_id;
        
        $action = 'Subscriber.Unsubscribe';
        if ( $check_subscribed ) $action = 'Subscribers.GetIsSubscribed';
        
        return $this->makeCall( $action
            , array(
                'params' => array(
                    'ListID' => $list_id
                    , 'Email' => $email
                )
            )
        );
    }
    
    /**
    * @return string A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Subscribers.GetIsSubscribed.aspx
    */
    function subscribersGetIsSubscribed( $email, $list_id = null )
    {
        return $this->subscriberUnsubscribe( $email, $list_id, true );
    }
    
    /**
    * Given an array of lists, indicate whether the $email is subscribed to each of those lists.
    *
    * @param string $email User's email
    * @param mixed $lists An associative array of lists to check against. Each key should be a List ID
    * @param boolean $no_assoc If true, only returns an array where each value indicates that the user is subscribed
    *        to that particular list. Otherwise, returns a fully associative array of $list_id => true | false.
    * @return mixed An array corresponding to $lists where true means the user is subscribed to that particular list.
    */
    function checkSubscriptions( $email, $lists, $no_assoc = true )
    {
        $nlist = array();
        foreach ( $lists as $lid => $misc )
        {
            $val = $this->subscribersGetIsSubscribed( $email, $lid );
            $val = $val != 'False';
            if ( $no_assoc && $val ) $nlist[] = $lid;
            elseif ( !$no_assoc ) $nlist[$lid] = $val;
        }
        
        return $nlist;
    }
    
    /**
    * @param string $email Email address.
    * @param string $name User's name.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @see http://www.campaignmonitor.com/api/Subscriber.AddAndResubscribe.aspx
    */
    
    function subscriberAddAndResubscribe( $email, $name, $list_id = null )
    {
        return $this->subscriberAdd( $email, $name, $list_id, true );
    }
    
    /**
    * @param string $email Email address.
    * @param string $name User's name.
    * @param mixed $fields Should only be a single-dimension array of key-value pairs.
    * @param int $list_id (Optional) A valid List ID to check against. If not given, the default class property is used.
    * @param boolean $resubscribe If true, does an equivalent 'AndResubscribe' API method.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Subscriber.AddAndResubscribeWithCustomFields.aspx
    */
    
    function subscriberAddAndResubscribeWithCustomFields( $email, $name, $fields, $list_id = null )
    {
        return $this->subscriberAddWithCustomFields( $email, $name, $fields, $list_id, true );
    }
    /**
     * Returns the details of a particular subscriber.
     * @param $list_id The ID of the list to which the subscriber belongs
     * @param $email The subscriber's email address
     * @return mixed A parsed response from the server, or null if something failed
     * @see http://www.campaignmonitor.com/api/method/subscribers-get-single-subscriber/
     */
    function subscriberGetSingleSubscriber($list_id = null, $email)
    {
        if (!$list_id != null)
            $list_id = $this->list_id;
        return $this->makeCall( 
            'Subscribers.GetSingleSubscriber',
            array(
                'params' => array(
                    'ListID' => $list_id,
                    'EmailAddress' => $email
                )
            )
        );
    }   
    /*
    * A generic wrapper to feed Client.* calls.
    *
    * @param string $method The API method to call.
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    */
    
    function clientGeneric( $method, $client_id = null )
    {
        if ( !$client_id )
            $client_id = $this->client_id;
        
        return $this->makeCall( 'Client.' . $method
            , array(
                'params' => array(
                    'ClientID' => $client_id
                )
            )
        );
    }
    
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Client.GetLists.aspx
    */
    
    function clientGetLists( $client_id = null )
    {
        return $this->clientGeneric( 'GetLists', $client_id );
    }
    
    /**
    * Creates an associative array with list_id => List_label pairings.
    *
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    */
    
    function clientGetListsDropdown( $client_id = null )
    {
        $lists = $this->clientGetLists( $client_id );
        if ( !isset( $lists['List'] ) )
            return null;
        else
            $lists = $lists['List'];
        
        $_lists = array();
        
        if ( isset( $lists[0] ) )
        {
            foreach ( $lists as $list )
                $_lists[$list['ListID']] = $list['Name'];
        }
        else
            $_lists[$lists['ListID']] = $lists['Name'];
        
        return $_lists;
    }
    
    /**
    * Creates an associative array with list_id:List_Label => (list_id) List_label pairings.
    * Remember that you'll need to split the key on ':' only once to get the appropriate ListID
    * and Segment Name.
    *
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    */
    
    function clientGetSegmentsDropdown( $client_id = null )
    {
        $lists = $this->clientGetSegments( $client_id );
        if ( !isset( $lists['List'] ) )
            return null;
        else
            $lists = $lists['List'];
        
        $_lists = array();
        
        if ( isset( $lists[0] ) )
        {
            foreach ( $lists as $list )
                $_lists[$list['ListID'].':'.$list['Name']] = '(' . $list['ListID'] . ') ' . $list['Name'];
        }
        else
            $_lists[$lists['ListID'].':'.$lists['Name']] = '(' . $lists['ListID'] . ') ' . $lists['Name'];
        
        return $_lists;
    }
    
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Client.GetCampaigns.aspx
    */
    
    function clientGetCampaigns( $client_id = null )
    {
        return $this->clientGeneric( 'GetCampaigns', $client_id );
    }
    
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Client.GetSegments.aspx
    */
    
    function clientGetSegments( $client_id = null )
    {
        return $this->clientGeneric( 'GetSegments', $client_id );
    }
    
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-getsuppressionlist/
    */
    function clientGetSuppressionList( $client_id = null )
    {
        return $this->clientGeneric( 'GetSuppressionList', $client_id );
    }
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-gettemplates/
    */
    function clientGetTemplates( $client_id = null )
    {
        return $this->clientGeneric( 'GetTemplates', $client_id );
    }
    
    /**
    * @param int $client_id (Optional) A valid Client ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-getdetail/
    */
    function clientGetDetail( $client_id = null )
    {
        return $this->clientGeneric( 'GetDetail', $client_id );
    }
    
    /**
    * @param string $companyName (CompanyName) Company name of the client to be added
    * @param string $contactName (ContactName) Contact name of the client to be added
    * @param string $emailAddress (EmailAddress) Email Address of the client to be added
    * @param string $country (Country) Country of the client to be added
    * @param string $timezone (Timezone) Timezone of the client to be added
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-create/
    */
    function clientCreate( $companyName, $contactName, $emailAddress, $country, $timezone )
    {
        return $this->makeCall( 'Client.Create'
            , array(
                'params' => array(
                    'CompanyName' => $companyName
                    , 'ContactName' => $contactName
                    , 'EmailAddress' => $emailAddress
                    , 'Country' => $country
                    , 'Timezone' => $timezone
                )
            )
        );
    }
    
    /**
    * @param int $client_id (ClientID) ID of the client to be updated
    * @param string $companyName (CompanyName) Company name of the client to be updated
    * @param string $contactName (ContactName) Contact name of the client to be updated
    * @param string $emailAddress (EmailAddress) Email Address of the client to be updated
    * @param string $country (Country) Country of the client to be updated
    * @param string $timezone (Timezone) Timezone of the client to be updated
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-create/
    */
    function clientUpdateBasics( $client_id, $companyName, $contactName, $emailAddress, $country, $timezone )
    {
        return $this->makeCall( 'Client.UpdateBasics'
            , array(
                'params' => array(
                    'ClientID' => $client_id
                    , 'CompanyName' => $companyName
                    , 'ContactName' => $contactName
                    , 'EmailAddress' => $emailAddress
                    , 'Country' => $country
                    , 'Timezone' => $timezone
                )
            )
        );
    }
    
    /**
    * @param int $client_id (ClientID) ID of the client to be updated
    * @param string $accessLevel (AccessLevel) AccessLevel of the client
    * @param string $username (Username) Clients username
    * @param string $password (Password) Password of the client
    * @param string $billingType (BillingType) BillingType that the client will be set as
    * @param string $currency (Currency) Currency that the client will pay in
    * @param string $deliveryFee (DeliveryFee) Per campaign deliivery fee for the campaign
    * @param string $costPerRecipient (CostPerRecipient) Per email fee for the client
    * @param string $designAndSpamTestFee (DesignAndSpamTestFee) Amount the client will
    *               be charged if they have access to send design/spam tests
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/client-updateaccessandbilling/
    */
    function clientUpdateAccessAndBilling( $client_id, $accessLevel, $username, $password, $billingType, $currency, $deliveryFee, $costPerRecipient, $designAndSpamTestFee )
    {
        return $this->makeCall( 'Client.UpdateAccessAndBilling'
            , array(
                'params' => array(
                    'ClientID' => $client_id
                    , 'AccessLevel' => $accessLevel
                    , 'Username' => $username
                    , 'Password' => $password
                    , 'BillingType' => $billingType
                    , 'Currency' => $currency
                    , 'DeliveryFee' => $deliveryFee
                    , 'CostPerRecipient' => $costPerRecipient
                    , 'DesignAndSpamTestFee' => $designAndSpamTestFee
                )
            )
        );
    }
    
    
    
    /**
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/User.GetClients.aspx
    */
    
    function userGetClients()
    {
        return $this->makeCall( 'User.GetClients' );
    }
    
    /**
    * @return string A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/User.GetSystemDate.aspx
    */
    
    function userGetSystemDate()
    {
        return $this->makeCall( 'User.GetSystemDate' );
    }
    
    /**
    * @return string A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/user-gettimezones/
    */
    
    function userGetTimezones()
    {
        return $this->makeCall( 'User.GetTimezones' );
    }
    
    /**
    * @return string A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/user-getcountries/
    */
    
    function userGetCountries()
    {
        return $this->makeCall( 'User.GetCountries' );
    }
    
    /**
     * Gets the API key for a Campaign Monitor user, given site URL, username, 
     * password. If the user has not already had their API key generated at 
     * the time this method is called, the userís API key will be generated 
     * and returned by this method.
     * 
     * @param $site_url The base URL of the site you use to login to 
     * Campaign Monitor. e.g. http://example.createsend.com/
     * @param $username The username you use to login to Campaign Monitor.
     * @param $password The password you use to login to Campaign Monitor.
     * @return mixed A parsed response from the server, or null if something 
     * failed.
     * @see http://www.campaignmonitor.com/api/method/user-getapikey/
     */
    function userGetApiKey($site_url, $username, $password)
    {
        return $this->makeCall(
            'User.GetApiKey', 
            array(
                'params' => array(
                    'SiteUrl' => $site_url,
                    'Username' => $username,
                    'Password' => $password,
                )
            )
        );
    }
    
    /**
    * A generic wrapper to feed Campaign.* calls.
    *
    * @param string $method The API method to call.
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    */
    
    function campaignGeneric( $method, $campaign_id = null )
    {
        if ( !$campaign_id )
            $campaign_id = $this->campaign_id;
        
        return $this->makeCall( 'Campaign.' . $method
            , array(
                'params' => array(
                    'CampaignID' => $campaign_id
                )
            )
        );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetSummary.aspx
    */
    
    function campaignGetSummary( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetSummary', $campaign_id );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetOpens.aspx
    */
    
    function campaignGetOpens( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetOpens', $campaign_id );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetBounces.aspx
    */
    
    function campaignGetBounces( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetBounces', $campaign_id );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetSubscriberClicks.aspx
    */
    
    function campaignGetSubscriberClicks( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetSubscriberClicks', $campaign_id );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetUnsubscribes.aspx
    */
    
    function campaignGetUnsubscribes( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetUnsubscribes', $campaign_id );
    }
    
    /**
    * @param int $campaign_id (Optional) A valid Campaign ID to check against. If not given, the default class property is used.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.GetLists.aspx
    */
    
    function campaignGetLists( $campaign_id = null )
    {
        return $this->campaignGeneric( 'GetLists', $campaign_id );
    }
    
    /**
    * @param int $client_id The ClientID you wish to use; set it to null to use the default class property.
    * @param string $name (CampaignName) Name of campaign
    * @param string $subject (CampaignSubject) Subject of campaign mailing
    * @param string $fromName (FromName) The From name of the sender
    * @param string $fromEmail (FromEmail) The email of the sender
    * @param string $replyTo (ReplyTo) An alternate email to send replies to
    * @param string $htmlUrl (HtmlUrl) Location of HTML body of email
    * @param string $textUrl (TextUrl) Location of plaintext body of email
    * @param array $subscriberListIds (SubscriberListIDs) An array of ListIDs. This will automatically be converted to the right format
    * @param array $listSegments (ListSegments) An array of segment names and their corresponding ListIDs. Each element needs to
    *        be an associative array with keys ListID and Name.
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/Campaign.Create.aspx
    */
    
    function campaignCreate( $client_id, $name, $subject, $fromName, $fromEmail, $replyTo, $htmlUrl, $textUrl, $subscriberListIds, $listSegments )
    {
        if ($client_id == null)
            $client_id = $this->client_id;
        $_subListIds = '';
        if ($subscriberListIds != "") {
            $_subListIds = array( 'string' => array() );
            if ( is_array( $subscriberListIds ) ) {
                foreach ( $subscriberListIds as $lid ) {
                    $_subListIds['string'][] = $lid;
                }
            }
        }
        $_seg = '';
        if ($listSegments != "")
        {
            $_seg = array();
            if (is_array($listSegments)) {
                for($i=0; $i < count($listSegments); $i++) {
                    foreach ($listSegments[$i] as $k => $v) {
                        $_seg['List'][$i][$k] = $v;
                    }
                }
            }
        }
        return $this->makeCall( 'Campaign.Create', array(
            'params' => array(
                'ClientID' => $client_id
                , 'CampaignName' => $name
                , 'CampaignSubject' => $subject
                , 'FromName' => $fromName
                , 'FromEmail' => $fromEmail
                , 'ReplyTo' => $replyTo
                , 'HtmlUrl' => $htmlUrl
                , 'TextUrl' => $textUrl
                , 'SubscriberListIDs' => $_subListIds
                , 'ListSegments' => $_seg
                )
            )
        );
    }
    
    /**
    * @param int $client_id The CampaignID you wish to use; set it to null to use the default class property
    * @param string $confirmEmail (ConfirmationEmail) Email address to send confirmation of campaign send to
    * @param string $sendDate (SendDate) The timestamp to send the campaign. It must be formatted as YYY-MM-DD HH:MM:SS 
    *               and should correspond to user's timezone.
    */
    
    function campaignSend( $campaign_id, $confirmEmail, $sendDate )
    {
        if ( $campaign_id == null )
            $campaign_id = $this->campaign_id;
        
        return $this->makeCall( 'Campaign.Send', array(
            'params' => array(
                'CampaignID' => $campaign_id
                , 'ConfirmationEmail' => $confirmEmail
                , 'SendDate' => $sendDate
                )
            )
        );
    }
    /**
     * Delete a campaign.
     * @param $campaign_id The ID of the campaign to delete.
     * @return A Status code indicating success or failure.
     * @see http://www.campaignmonitor.com/api/method/campaign-delete/
     */
    function campaignDelete($campaign_id)
    {
        return $this->campaignGeneric('Delete', $campaign_id);
    }
    /**
    * @param int $client_id (ClientID) ID of the client the list will be created for
    * @param string $title (Title) Name of the new list
    * @param string $unsubscribePage (UnsubscribePage) URL of the page users will be 
    *               directed to when they unsubscribe from this list.
    * @param string $confirmOptIn (ConfirmOptIn) If true, the user will be sent a confirmation
    *               email before they are added to the list. If they click the link to confirm
    *               their subscription they will be added to the list. If false, they will be
    *               added automatically.
    * @param string $confirmationSuccessPage (ConfirmationSuccessPage) URL of the page that
    *               users will be sent to if they confirm their subscription. Only required when
                    $confirmOptIn is true.
    * @see http://www.campaignmonitor.com/api/method/list-create/
    */
    function listCreate( $client_id, $title, $unsubscribePage, $confirmOptIn, $confirmationSuccessPage )
    {
        if ( $confirmOptIn == 'false' )
            $confirmationSuccessPage = '';
            
        return $this->makeCall( 'List.Create', array(
            'params' => array(
                'ClientID' => $client_id
                , 'Title' => $title
                , 'UnsubscribePage' => $unsubscribePage
                , 'ConfirmOptIn' => $confirmOptIn
                , 'ConfirmationSuccessPage' => $confirmationSuccessPage
                )
            )
        );
    }
    
    /**
    * @param int $list_id (List) ID of the list to be updated
    * @param string $title (Title) Name of the new list
    * @param string $unsubscribePage (UnsubscribePage) URL of the page users will be 
    *               directed to when they unsubscribe from this list.
    * @param string $confirmOptIn (ConfirmOptIn) If true, the user will be sent a confirmation
    *               email before they are added to the list. If they click the link to confirm
    *               their subscription they will be added to the list. If false, they will be
    *               added automatically.
    * @param string $confirmationSuccessPage (ConfirmationSuccessPage) URL of the page that
    *               users will be sent to if they confirm their subscription. Only required when
                    $confirmOptIn is true.
    * @see http://www.campaignmonitor.com/api/method/list-update/
    */
    function listUpdate( $list_id, $title, $unsubscribePage, $confirmOptIn, $confirmationSuccessPage )
    {
        if ( $confirmOptIn == 'false' )
            $confirmationSuccessPage = '';
            
        return $this->makeCall( 'List.Update', array(
            'params' => array(
                'ListID' => $list_id
                , 'Title' => $title
                , 'UnsubscribePage' => $unsubscribePage
                , 'ConfirmOptIn' => $confirmOptIn
                , 'ConfirmationSuccessPage' => $confirmationSuccessPage
                )
            )
        );
    }
    
    /**
    * @param int $list_id (List) ID of the list to be deleted
    * @see http://www.campaignmonitor.com/api/method/list-delete/
    */
    function listDelete( $list_id )
    {           
        return $this->makeCall( 'List.Delete', array(
            'params' => array(
                'ListID' => $list_id
                )
            )
        );
    }
    
    /**
    * @param int $list_id (List) ID of the list to be deleted
    * @see http://www.campaignmonitor.com/api/method/list-getdetail/
    */
    function listGetDetail( $list_id )
    {           
        return $this->makeCall( 'List.GetDetail', array(
            'params' => array(
                'ListID' => $list_id
                )
            )
        );
    }
    /**
     * Gets statistics for a subscriber list
     * @param $list_id The ID of the list whose statistics will be returned.
     * @return mixed A parsed response from the server, or null if something 
     * @see http://www.campaignmonitor.com/api/method/list-getstats/
     */
    function listGetStats($list_id)
    {
        return $this->makeCall(
            'List.GetStats',
            array(
                'params' => array(
                    'ListID' => $list_id
                )
            )
        );
    }
    
    /**
    * @param int $list_id (ListID) A valid list ID to check against. 
    * @param string $fieldName (FieldName) Name of the new custom field
    * @param string $dataType (DataType) Data type of the field. Options are Text, Number, 
    *               MultiSelectOne, or MultiSelectMany
    * @param string $Options (Options) The available options for a multi-valued custom field. 
    *               Options should be separated by a double pipe ì||î. This field must be null 
    *               for Text and Number custom fields
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/list-createcustomfield/
    */
    
    function listCreateCustomField( $list_id, $fieldName, $dataType, $options )
    {
        if ( $dataType == 'Text' || $dataType == 'Number' )
            $options = null;
            
        return $this->makeCall( 'List.CreateCustomField', array(
            'params' => array(
                'ListID' => $list_id
                , 'FieldName' => $fieldName
                , 'DataType' => $dataType
                , 'Options' => $options
                )
            )
        );
    }
    
    /**
    * @param int $list_id (ListID) A valid list ID to check against. 
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/list-getcustomfields/
    */
    
    function listGetCustomFields( $list_id )
    {           
        return $this->makeCall( 'List.GetCustomFields', array(
            'params' => array(
                'ListID' => $list_id
                )
            )
        );
    }
    
    /**
    * @param int $list_id (ListID) A valid list ID to check against. 
    * @param int $key (Key) The Key of the field we want to delete. 
    * @return mixed A parsed response from the server, or null if something failed.
    * @see http://www.campaignmonitor.com/api/method/list-deletecustomfield/
    */
    
    function listDeleteCustomField( $list_id, $key )
    {       
        return $this->makeCall( 'List.DeleteCustomField', array(
            'params' => array(
                'ListID' => $list_id
                , 'Key' => $key
                )
            )
        );
    }
    
    /**
     * @param int $client_id (ClientID) ID of the client the template will be created for
     * @param string $template_name (TemplateName) Name of the new template
     * @param string $html_url (HTMLPageURL) URL of the HTML page you have created for the template
     * @param string $zip_url (ZipFileURL) URL of a zip file containing any other files required by the template
     * @param string $screenshot_url (ScreenshotURL) URL of a screenshot of the template
     * @see http://www.campaignmonitor.com/api/method/template-create/
     */
    function templateCreate($client_id, $template_name, $html_url, $zip_url, $screenshot_url)
    {
        return $this->makeCall('Template.Create', array(
            'params' => array(
                'ClientID' => $client_id,
                'TemplateName' => $template_name,
                'HTMLPageURL' => $html_url,
                'ZipFileURL' => $zip_url,
                'ScreenshotURL' => $screenshot_url
            ))
        );
    }
    
    /**
     * @param string $template_id (TemplateID) ID of the template whose details are being requested
     * @see http://www.campaignmonitor.com/api/method/template-getdetail/
     */
    function templateGetDetail($template_id)
    {
        return $this->makeCall('Template.GetDetail', array(
            'params' => array(
                'TemplateID' => $template_id
            ))
        );
    }
    /**
     * @param string $template_id (TemplateID) ID of the template to be updated
     * @param string $template_name (TemplateName) Name of the template
     * @param string $html_url (HTMLPageURL) URL of the HTML page you have created for the template
     * @param string $zip_url (ZipFileURL) URL of a zip file containing any other files required by the template
     * @param string $screenshot_url (ScreenshotURL) URL of a screenshot of the template
     * @see http://www.campaignmonitor.com/api/method/template-update/
     */
    function templateUpdate($template_id, $template_name, $html_url, $zip_url, $screenshot_url)
    {
        return $this->makeCall('Template.Update', array(
            'params' => array(
                'TemplateID' => $template_id,
                'TemplateName' => $template_name,
                'HTMLPageURL' => $html_url,
                'ZIPFileURL' => $zip_url,
                'ScreenshotURL' => $screenshot_url
            ))
        );
    }
    /**
     * @param string $template_id (TemplateID) ID of the template to be deleted
     * @see http://www.campaignmonitor.com/api/method/template-delete/
     */
    function templateDelete($template_id)
    {
        return $this->makeCall('Template.Delete', array(
            'params' => array(
                'TemplateID' => $template_id
            ))
        );
    }
}