php - How to get access token facebook api correct way? -


just playing around facebook api couldn't basic setup.downloaded sdk facebooksdk. cant seem access token working 

$fb = new facebook\facebook([   'app_id' => 'keyxx',   'app_secret' => 'key',   'default_graph_version' => 'v2.4',   ]); $helper = $fb->getredirectloginhelper();    $accesstoken = $helper->getaccesstoken();  try {   // returns `facebook\facebookresponse` object   $response = $fb->get('/me?fields=id,name',$accesstoken); } catch(facebook\exceptions\facebookresponseexception $e) {   echo 'graph returned error: ' . $e->getmessage();   exit; } catch(facebook\exceptions\facebooksdkexception $e) {   echo 'facebook sdk returned error: ' . $e->getmessage();   exit; }  $user = $response->getgraphuser();  echo 'name: ' . $user['name'];  ?>

forgot mention app canvas try redirecting not work. see blank canvas

<?php  require_once 'facebook-php-sdk-v4/src/facebook/autoload.php'; session_start() echo 'hello';    $fb = new facebook\facebook([   'app_id' => 'x',   'app_secret' => 'y',   'default_graph_version' => 'v2.4',   'default_access_token' => isset($_session['facebook_access_token']) ? $_session['facebook_access_token'] : 'x|y'    ]);   try {   $response = $fb->get('/me?fields=id,name');   $user = $response->getgraphuser();   echo 'name: ' . $user['name'];   exit; //redirect, or whatever want } catch(facebook\exceptions\facebookresponseexception $e) {   //echo 'graph returned error: ' . $e->getmessage(); } catch(facebook\exceptions\facebooksdkexception $e) {   //echo 'facebook sdk returned error: ' . $e->getmessage(); }  $helper = $fb->getredirectloginhelper(); $permissions = ['email', 'user_likes']; $loginurl = $helper->getloginurl('http://www.unsquaringthewheel.com/newtemp/login-callback.php', $permissions); echo '<a href="' . $loginurl . '">log in facebook!</a>';  ?>

this callback login page

<?php require_once 'facebook-php-sdk-v4/src/facebook/autoload.php';  session_start();  $fb = new facebook\facebook([   'app_id' => 'x',   'app_secret' => 'y',   'default_graph_version' => 'v2.4',   'default_access_token' => 'x|y' ]);  $helper = $fb->getredirectloginhelper();  try {   $accesstoken = $helper->getaccesstoken(); } catch(facebook\exceptions\facebookresponseexception $e) {   // when graph returns error   //echo 'graph returned error: ' . $e->getmessage(); } catch(facebook\exceptions\facebooksdkexception $e) {   // when validation fails or other local issues   //echo 'facebook sdk returned error: ' . $e->getmessage(); }  if (isset($accesstoken)) {   // logged in!   $_session['facebook_access_token'] = (string) $accesstoken; } elseif ($helper->geterror()) {   // user denied request } header('location: index.php'); 

$fb = new facebook\facebook([   'app_id' => '{app-id}',   'app_secret' => '{app-secret}',   'default_graph_version' => 'v2.4'   ]);  $res = $fb->get('/me', '{access-token}');

reference


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