I've been struggling with this one for a few days now. I've got a test app set up to connect to LinkedIn via OAuth. I want to be able to update a user's status, but at the moment I'm unable to interact with LinkedIn's API at all.

I am able to successfully get a requestToken, then an accessToken, but when I issue a request to the API, I see an 'unauthorized' error that looks something like this:

object(OAuthException)#2 (8) { 
 ["message:protected"]=>  string(73) "Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect)" 
 ["string:private"]=>  string(0) "" 
 ["code:protected"]=>  int(401) 
 ["file:protected"]=>  string(47) "/home/pmfeorg/public_html/dev/test/linkedin.php" 
 ["line:protected"]=>  int(48) 
 ["trace:private"]=>  array(1) { 
  [0]=>  array(6) { 
   ["file"]=>  string(47) "/home/pmfeorg/public_html/dev/test/linkedin.php" 
   ["line"]=>  int(48) 
   ["function"]=>  string(5) "fetch" 
   ["class"]=>  string(5) "OAuth" 
   ["type"]=>  string(2) "->" 
   ["args"]=>  array(2) { 
    [0]=>  string(35) "http://api.linkedin.com/v1/people/~" 
    [1]=>  string(3) "GET" 
   } 
  } 
 } 
 ["lastResponse"]=>  string(358) "  401  1276375790558  0000  [unauthorized]. OAU:Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy|48032b2d-bc8c-4744-bb84-4eab53578c11|*01|*01:1276375790:xmc3lWhXJvLSUZh4dxMtrf55VVQ= " 
 ["debugInfo"]=>  array(5) { 
 ["sbs"]=>  string(329) "GET&http%3A%2F%2Fapi.linkedin.com%2Fv1%2Fpeople%2F~&oauth_consumer_key%3DBhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy%26oauth_nonce%3D7068001084c13f2ee6a2117.22312548%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1276375790%26oauth_token%3D48032b2d-bc8c-4744-bb84-4eab53578c11%26oauth_version%3D1.0" 
 ["headers_sent"]=>  string(401) "GET /v1/people/~?GET&oauth_consumer_key=Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy&oauth_signature_method=HMAC-SHA1&oauth_nonce=7068001084c13f2ee6a2117.22312548&oauth_timestamp=1276375790&oauth_version=1.0&oauth_token=48032b2d-bc8c-4744-bb84-4eab53578c11&oauth_signature=xmc3lWhXJvLSUZh4dxMtrf55VVQ%3D HTTP/1.1 User-Agent: PECL-OAuth/1.0-dev Host: api.linkedin.com Accept: */*" 
 ["headers_recv"]=>  string(148) "HTTP/1.1 401 Unauthorized Server: Apache-Coyote/1.1 Date: Sat, 12 Jun 2010 20:49:50 GMT Content-Type: text/xml;charset=UTF-8 Content-Length: 358" 
 ["body_recv"]=>  string(358) "  401  1276375790558  0000  [unauthorized]. OAU:Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy|48032b2d-bc8c-4744-bb84-4eab53578c11|*01|*01:1276375790:xmc3lWhXJvLSUZh4dxMtrf55VVQ= " 
 ["info"]=>  string(216) "About to connect() to api.linkedin.com port 80 (#0) Trying 64.74.98.83... connected Connected to api.linkedin.com (64.74.98.83) port 80 (#0) Connection #0 to host api.linkedin.com left intact Closing connection #0 " 
 }
} 

My code looks like this (based on the FireEagle example from php.net):

$req_url = 'https://api.linkedin.com/uas/oauth/requestToken';
$authurl = 'https://www.linkedin.com/uas/oauth/authenticate';
$acc_url = 'https://api.linkedin.com/uas/oauth/accessToken';
$api_url = 'http://api.linkedin.com/v1/people/~';
$callback = 'http://www.pmfe.org/dev/test/linkedin.php';
$conskey = 'Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy';
$conssec = '####################SECRET KEY#####################';

session_start();

try {
  $oauth = new OAuth($conskey,$conssec,OAUTH_SIG_METHOD_HMACSHA1,OAUTH_AUTH_TYPE_URI);
  $oauth->enableDebug();

  if(!isset($_GET['oauth_token'])) {
    $request_token_info = $oauth->getRequestToken($req_url);
    $_SESSION['secret'] = $request_token_info['oauth_token_secret'];
    header('Location: '.$authurl.'?oauth_token='.$request_token_info['oauth_token']);
    exit;
  } else {
    $oauth->setToken($_GET['oauth_token'],$_SESSION['secret']);
    $access_token_info = $oauth->getAccessToken($acc_url);
    $_SESSION['token'] = $access_token_info['oauth_token'];
    $_SESSION['secret'] = $access_token_info['oauth_token_secret'];
  } 
    $oauth->setToken($_SESSION['token'],$_SESSION['secret']);
 $oauth->fetch($api_url, OAUTH_HTTP_METHOD_GET);

 $response = $oauth->getLastResponse();
} catch(OAuthException $E) {
  var_dump($E);
}

I've successfully set up a connection to Twitter and one to Facebook using OAuth, but LinkedIn keeps eluding me. If anyone could offer some advice or point me in the right direction, I will be extremely appreciative!