oop — PHP $ this- & gt; неправильно устанавливает переменную

EDIT2:
ПОЛНЫЙ РАБОЧИЙ КОД

<?php
include_once('config.php');
function getAccountCredentials(){
//here we are getting our account credentias from the accountConfiguration class
$accountCredentials = new accountConfiguration;
$account_id = $accountCredentials->account_id;
$api_accesskey = $accountCredentials->api_accesskey;
$accountArray = array('account_id'=>$account_id, 'api_accesskey'=>$api_accesskey);
$transactionRequestParameters = json_encode(array('data'=>$accountArray), JSON_PRETTY_PRINT);
$decode = json_decode($transactionRequestParameters, true, 4);
$credentials = array_shift($decode);
return $credentials;
}
function getBaseURL($val){
$baseURL = new baseURL;
$url = $baseURL->url;
return $url.$val;
}

class apiRequest{
private $url;
private $params = array();
public $response = array();
public function setUrl($val) {
$baseUrl = getBaseURL($val);
$this->url = $baseUrl;
}

public function setAccountCredentials(){
//This calls our account credentials function.
$account_info = getAccountCredentials();
//Here We're setting our account information to variables.
$account_id=$account_info['account_id'];
$api_accesskey = $account_info['api_accesskey'];
//Here I am setting the account information to the params variable.
$this->setParam('account_id', $account_id);
$this->setParam('api_accesskey', $api_accesskey);
}
public function setParam($pname, $value) {
$this->params[$pname] = $value;
}
public function setParams($params) {
if (is_array($params)) {
$this->params = array_merge($this->params, $params);
} else {
die('Must send array');
}
}
public function sendRequest(){
$pdata = $this->params;
$url = $this->url;
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $pdata);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSLVERSION, 6);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$res = curl_exec($ch);
$response_decode = json_decode($res, true);
var_export($this->response = $response_decode);
}
public function ReportingServices($request_parameters){
$api_url = "REDACTED";
$request = new apiRequest;
$request->setAccountCredentials();
$request->setUrl($api_url);
$request_information = array('response_format'=>'JSON');
$request ->setParams($request_information);
$request ->setParams($request_parameters);
$request->sendRequest();
}
}

$request = new apiRequest;
$values = array ('start_date'=>'2015-04-15','end_date'=>'2015-04-18');
$request->ReportingServices($values);
?>

Что я пытаюсь сделать:

Теперь, если я добавлю эту функцию в свой метод.

public function getResponse(){
return $this->response;
var_export($this->response);
}

Затем отредактируйте sendRequest() сделать следующее:

public function sendRequest(){
$pdata = $this->params;
$url = $this->url;
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $pdata);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSLVERSION, 6);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$res = curl_exec($ch);
$response_decode = json_decode($res, true);
$this->response = $response_decode;
}

Затем вызовите мой метод так:

$request = new apiRequest;
$values = array ('start_date'=>'2015-04-15','end_date'=>'2015-04-18');
$request->ReportingServices($values);
$response = $request->getResponse();
var_export($response);

var_export на $response не работает.