jquery - Can't get user id from facebook signedRequest in PHP . -


on index page initialize javascript sdk , go through login/authorization flow. use ajax pass signed request php page parsed. code parsing signed request copied directly documentation, haven't changed anything. @ end of code try user info returned in same object signed request, when try log of variables in ajax success callback, come 'undefined'. 

//html  function oncheckloginstatus (response)     {      if (response.status != "connected")      {       //redirect login page;      }      else      {       //connected, signed request response object , pass php page via ajax        $.ajax({         url : "http://xxxxxxx/bn/signedrequest.php",         type : 'post',         data: {signed_request: response.authresponse.signedrequest},         success : function (result) {             console.log("success");              //this coming undefined                   console.log(result.uid);         },         error : function () {            alert("error");         }     });  //php     <?php  define('facebook_app_id', '27xxxxxx0&'); // place app id here define('facebook_secret', '8ea907xxxxxxx9e958'); // place app secret here  //get signed request  $signed_request = $_request['signed_request'];     function parse_signed_request($signed_request, $secret)  { list($encoded_sig, $payload) = explode('.', $signed_request, 2); // decode data $sig = base64_url_decode($encoded_sig); $data = json_decode(base64_url_decode($payload), true); if (strtoupper($data['algorithm']) !== 'hmac-sha256') { error_log('unknown algorithm. expected hmac-sha256'); return null; }   // check sig $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true); if ($sig !== $expected_sig)  { error_log('bad signed json signature!'); return null; } return $data; } function base64_url_decode($input)  { return base64_decode(strtr($input, '-_', '+/')); }  if ($_request)  { $response = parse_signed_request($_request['signed_request'], facebook_secret); }   $uid = $response["user_id"]; $name = $response["registration"]["name"];  $city = $response["registration"]["location"]["name"];  echo json_encode($uid);    ?>

either send entire $response

or

change echo line 

echo($uid);

and change console.log line in ajax call 

console.log(result);

you can verify logging result 

 $.ajax({         url : "http://xxxxxxx/bn/signedrequest.php",         type : 'post',         data: {signed_request: response.authresponse.signedrequest},         success : function (result) {             console.log("success");              //this coming undefined              console.log(result); // <----- check whether result undefined         },         error : function () {            alert("error");         }     });

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