PHP Login with Facebook creating infinite redirect loop

Question

I am having an issue with Facebook Login and PHP.

The file below seems to be causing the issue. Everything works until the point I login with Facebook successfully and the browser eventually throws out an infinite redirect error when redirecting back to this file. The last else statement is always being executed causing the loop...

Any ideas? Thanks in advance!

<?php


require 'facebook/facebook.php';
require 'config/fbconfig.php';
require 'config/functions.php';

$facebook = new Facebook(array(
            'appId' => APP_ID,
            'secret' => APP_SECRET,
            ));

$user = $facebook->getUser();

if ($user) {
  try {
    // Proceed knowing you have a logged in user who's authenticated.
    $user_profile = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    error_log($e);
    $user = null;
  }


    if (!empty($user_profile )) {
        # User info ok? Let's print it (Here we will be adding the login and registering routines)

        $username = $user_profile['name'];
    $uid = $user_profile['id'];
    $email = $user_profile['email'];
        $user = new User();
        $userdata = $user->checkUser($uid, 'facebook', $username,$email,$twitter_otoken,$twitter_otoken_secret);

        if(!empty($userdata)){
            session_start();
            $_SESSION['id'] = $userdata['id'];
        $_SESSION['oauth_id'] = $uid;
        $_SESSION['username'] = $userdata['username'];
        $_SESSION['email'] = $email;
            $_SESSION['oauth_provider'] = $userdata['oauth_provider'];
            header("Location: home.php");
        }
    } else {
        # For testing purposes, if there was an error, let's kill the script
        die("There was an error.");
    }
} else {
    # There's no active session, let's generate one
    $login_url = $facebook->getLoginUrl(array( 'scope' => 'email'));
    header("Location: " . $login_url);
}
?>

Answer 1

I had the same problem, in base_facebook.php

look for:

public static $CURL_OPTS = array(
    CURLOPT_CONNECTTIMEOUT => 10,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT        => 60,
    CURLOPT_USERAGENT      => 'facebook-php-3.2'
  );

and add the following 2 lines

CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => false

so you have

public static $CURL_OPTS = array(
     CURLOPT_CONNECTTIMEOUT => 10,
     CURLOPT_RETURNTRANSFER => true,
     CURLOPT_TIMEOUT        => 60,
     CURLOPT_USERAGENT      => 'facebook-php-3.2',
     CURLOPT_SSL_VERIFYPEER => false,
     CURLOPT_SSL_VERIFYHOST => false
);