Ttdfjt

I am trying to access magento rest api with following script, but is uses default guest role to access, so I cannot access orders and other stuffs. How can I access Magento Rest api as admin.

<?php

$callbackUrl = "http://192.168.1.144/o2/api/rest/orders";
$temporaryCredentialsRequestUrl =
"http://192.168.1.144/o2/oauth/initiate?oauth_callback=" .
urlencode($callbackUrl);
$adminAuthorizationUrl = 'http://192.168.1.144/o2/admin/oAuth_authorize';
$accessTokenRequestUrl = 'http://192.168.1.144/o2/oauth/token';
$apiUrl = 'http://192.168.1.144/o2/api/rest';
$consumerKey = '**********************';
$consumerSecret = '**********************';

session_start();
if (!isset($_GET['oauth_token']) && isset($_SESSION['state']) &&
$_SESSION['state'] == 1) 
 $_SESSION['state'] = 0;

try 
 $authType = ($_SESSION['state'] == 2) ? OAUTH_AUTH_TYPE_AUTHORIZATION
: OAUTH_AUTH_TYPE_URI;
 $oauthClient = new OAuth($consumerKey, $consumerSecret,
OAUTH_SIG_METHOD_HMACSHA1, $authType);
 $oauthClient->enableDebug();

 if (!isset($_GET['oauth_token']) && !$_SESSION['state']) 
 $requestToken =
$oauthClient->getRequestToken($temporaryCredentialsRequestUrl);
 $_SESSION['secret'] = $requestToken['oauth_token_secret'];
 $_SESSION['state'] = 1;
 header('Location: ' . $adminAuthorizationUrl . '?oauth_token=' .
$requestToken['oauth_token']);
 exit;
 else if ($_SESSION['state'] == 1) 
 $oauthClient->setToken($_GET['oauth_token'], $_SESSION['secret']);
 $accessToken =
$oauthClient->getAccessToken($accessTokenRequestUrl);
 $_SESSION['state'] = 2;
 $_SESSION['token'] = $accessToken['oauth_token'];
 $_SESSION['secret'] = $accessToken['oauth_token_secret'];
 header('Location: ' . $callbackUrl);
 exit;
 else 
 $oauthClient->setToken($_SESSION['token'], $_SESSION['secret']);
 $resourceUrl = "$apiUrl/orders";
 $oauthClient->fetch($resourceUrl);
 $productsList = json_decode($oauthClient->getLastResponse());
 print_r($productsList);
 
 catch (OAuthException $e) 
 print_r($e);