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Linkedin login in PHP using Auth2

LinkedIn login has been closed his support with v1 API and it’s no longer working now with v1. LinkedIn is working with v2 app. So, guys first you will create an APP on LinkedIn. you can use this link (https://www.linkedin.com/developers/apps/new) to create a new APP. You will fill up the form and create the APP.

I will learn you about code. Please follow up below guideline.

  1. Create A file “config.php”

  // LinkedIn API configuration

define(‘CLIENT_ID’, ‘LinkedIn_App_ID’);

define(‘CLIENT_SECRET’, ‘LinkedIn_App_Secret’); define(‘REDIRECT_URL’, ‘OAuth_Callback_URL’);

define(‘SCOPE’, ‘r_liteprofile r_emailaddress’); //API permissions

// Start session

if(!session_id()){ session_start(); }

// Include the oauth client library

require_once ‘oauth-client/http.php’;

require_once ‘oauth-client/oauth_client.php’;

2. Create A file “index.php”

require_once ‘config.php’;

$authUrl = $output = ”;

// If user already verified
if(isset($_SESSION[‘oauth_status’]) && $_SESSION[‘oauth_status’] == ‘verified’ && !empty($_SESSION[‘userData’])){
// Retrieve user’s profile data from session
$userData = $_SESSION[‘userData’];

// Prepare output to show LinkedIn profile data
$output = ‘<h2>LinkedIn Profile Details</h2>’;
$output .= ‘<div class=”ac-data”>’;
$output .= ‘<img src=”‘.$userData[‘picture’].'”/>’;
$output .= ‘<p><b>LinkedIn ID:</b> ‘.$userData[‘oauth_uid’].'</p>’;
$output .= ‘<p><b>Name:</b> ‘.$userData[‘first_name’].’ ‘.$userData[‘last_name’].'</p>’;
$output .= ‘<p><b>Email:</b> ‘.$userData[’email’].'</p>’;
$output .= ‘<p><b>Logged in with:</b> LinkedIn’.'</p>’;
$output .= ‘<p><b>Profile Link:</b> <a href=”‘.$userData[‘link’].'” target=”_blank”>Click to visit LinkedIn page</a></p>’;
$output .= ‘<p><b>Logout from</b> <a href=”logout.php”>LinkedIn</a></p>’;
$output .= ‘</div>’;
}elseif((isset($_GET[“oauth_init”]) && $_GET[“oauth_init”] == 1) || (isset($_GET[‘oauth_token’]) && isset($_GET[‘oauth_verifier’])) || (isset($_GET[‘code’]) && isset($_GET[‘state’]))){
$client = new oauth_client_class;

$client->client_id = CLIENT_ID;
$client->client_secret = CLIENT_SECRET;
$client->redirect_uri = REDIRECT_URL;
$client->scope = SCOPE;
$client->debug = 1;
$client->debug_http = 1;
$application_line = __LINE__;

if(strlen($client->client_id) == 0 || strlen($client->client_secret) == 0){
die(‘Please go to LinkedIn Apps page https://www.linkedin.com/secure/developer?newapp= , ‘.
‘create an application, and in the line ‘.$application_line.
‘ set the client_id to Consumer key and client_secret with Consumer secret. ‘.
‘The Callback URL must be ‘.$client->redirect_uri.’. Make sure you enable the ‘.
‘necessary permissions to execute the API calls your application needs.’);

// If authentication returns success
if($success = $client->Initialize()){
if(($success = $client->Process())){
$client->error = $client->authorization_error;
$success = false;
$success = $client->CallAPI(
‘GET’, array(
), array(‘FailOnAccessError’=>true), $userInfo);
$emailRes = $client->CallAPI(
‘GET’, array(
), array(‘FailOnAccessError’=>true), $userEmail);
$success = $client->Finalize($success);

if($client->exit) exit;

$client->error = $client->authorization_error;
$success = false;

// Initialize User class

// Getting user’s profile data
$inUserData = array();
$inUserData[‘oauth_uid’] = !empty($userInfo->id)?$userInfo->id:”;
$inUserData[‘first_name’] = !empty($userInfo->firstName->localized->en_US)?$userInfo->firstName->localized->en_US:”;
$inUserData[‘last_name’] = !empty($userInfo->lastName->localized->en_US)?$userInfo->lastName->localized->en_US:”;
$inUserData[’email’] = !empty($userEmail->elements[0]->{‘handle~’}->emailAddress)?$userEmail->elements[0]->{‘handle~’}->emailAddress:”;
$inUserData[‘picture’] = !empty($userInfo->profilePicture->{‘displayImage~’}->elements[0]->identifiers[0]->identifier)?$userInfo->profilePicture->{‘displayImage~’}->elements[0]->identifiers[0]->identifier:”;
$inUserData[‘link’] = ‘https://www.linkedin.com/’;

// Insert or update user data to the database
$inUserData[‘oauth_provider’] = ‘linkedin’;
//Storing user data into session
$_SESSION[‘userData’] = $userData;
$_SESSION[‘oauth_status’] = ‘verified’;

//Redirect the user back to the same page
header(‘Location: ./’);
$output = ‘<h3 style=”color:red”>Error connecting to LinkedIn! try again later!</h3><p>’.HtmlSpecialChars($client->error).'</p>’;
}elseif(isset($_GET[“oauth_problem”]) && $_GET[“oauth_problem”] <> “”){
$output = ‘<h3 style=”color:red”>’.$_GET[“oauth_problem”].'</h3>’;
$authUrl = ‘?oauth_init=1’;

// Render LinkedIn login button
$output = ‘<a href=”?oauth_init=1″><img src=”images/linkedin-sign-in-btn.png”></a>’;
<!DOCTYPE html>
<html lang=”en”>
<title>Login with LinkedIn using PHP by CodexWorld</title>

<!– Include stylesheet file –>
<link rel=”stylesheet” href=”css/style.css”/>
<div class=”container”>
<div class=”in-box”>
<!– Display login button / profile information –>
<?php echo $output; ?>

3.  Logout.php

// Start session

// Unset token and user data from session

// Destroy entire session

// Redirect to homepage


Above codes are working now. you just need to copy and paste the code. If above codes are helping you for LinkedIn login and you wish to contribute  me for posting and writing such types of blogs in future. you can pay on following link:

Link 1: https://p-y.tm/Wan-TgT

Link2: https://www.paypal.me/spiderwebbie


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