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Hiii, You all know that to allow the user to connect on Linkedin, Facebook or Gmail, etc on your site, you require an API. So,here in this post I will teach you how to connect and fetch the data from any Linkedin account with the help of linkedin API. This functionality is required to add a “Connect To Linkedin” button on your site to directly make the user visiting your site to directly connect to linkedin .

Through this tutorial, you can fetch connections, profile details, job updates, etc from Linkedin profile after login. In this tutorial I am fetching the full profile details of the person who is logging in but you can fetch details according to your needs by changing scope details from “r_fullprofile” to any other like "r_network". Information about scope is present on Linkedin Developer site

To run this tutorial firstly you need an API KEY and Secret API , which you can get very easily by registering your site/application to linkedin.

<?php
// Change these
define(‘API_KEY’,      ‘your api key here’                                          );
define(‘API_SECRET’,   ‘your secret key here’                                       );
define(‘REDIRECT_URI’, ‘your redirect url’);              //in our case, redirect it on this page
define(‘SCOPE’,        ‘r_fullprofile r_emailaddress rw_nus’     );

// You’ll probably use a database
session_name(‘linkedin’);
session_start();
//$_SESSION['state']=”India”;
// OAuth 2 Control Flow
if (isset($_GET['error'])) {
// LinkedIn returned an error
print $_GET['error'] . ‘: ‘ . $_GET['error_description'];
exit;
} elseif (isset($_GET['code'])) {
// User authorized your application

// Get token so you can make API calls
getAccessToken();
} else {
if ((empty($_SESSION['expires_at'])) || (time() > $_SESSION['expires_at'])) {
// Token has expired, clear the state
$_SESSION = array();
}
if (empty($_SESSION['access_token'])) {
// Start authorization process
getAuthorizationCode();
}
}

// Congratulations! You have a valid token. Now fetch your profile
$user = fetch(‘GET’, ‘/v1/people/~:(id,firstName,lastName,skills,headline,location,industry,email-address,network)’);
//print “Hello $user->firstName $user->lastName.”;
echo “<pre>”;
print_r($user);
echo “<pre>”;
exit;

function getAuthorizationCode() {
$params = array(‘response_type’ => ‘code’,
‘client_id’ => API_KEY,
‘scope’ => SCOPE,
‘state’ => uniqid(”, true), // unique long string
‘redirect_uri’ => REDIRECT_URI,
);

// Authentication request
$url = ‘https://www.linkedin.com/uas/oauth2/authorization?&#8217; . http_build_query($params);

// Needed to identify request when it returns to us
$_SESSION['state'] = $params['state'];

// Redirect user to authenticate
header(“Location: $url”);
exit;
}

function getAccessToken() {
$params = array(‘grant_type’ => ‘authorization_code’,
‘client_id’ => API_KEY,
‘client_secret’ => API_SECRET,
‘code’ => $_GET['code'],
‘redirect_uri’ => REDIRECT_URI,
);

// Access Token request
$url = ‘https://www.linkedin.com/uas/oauth2/accessToken?&#8217; . http_build_query($params);

// Tell streams to make a POST request
$context = stream_context_create(
array(‘http’ =>
array(‘method’ => ‘POST’,
)
)
);

// Retrieve access token information
$response = file_get_contents($url, false, $context);

// Native PHP object, please
$token = json_decode($response);

// Store access token and expiration time
$_SESSION['access_token'] = $token->access_token; // guard this!
$_SESSION['expires_in']   = $token->expires_in; // relative time (in seconds)
$_SESSION['expires_at']   = time() + $_SESSION['expires_in']; // absolute time

return true;
}

function fetch($method, $resource, $body = ”) {
$params = array(‘oauth2_access_token’ => $_SESSION['access_token'],
‘format’ => ‘json’,
);

// Need to use HTTPS
$url = ‘https://api.linkedin.com&#8217; . $resource . ‘?’ . http_build_query($params);
// Tell streams to make a (GET, POST, PUT, or DELETE) request
$context = stream_context_create(
array(‘http’ =>
array(‘method’ => $method,
)
)
);

$response = file_get_contents($url, false, $context);

// Native PHP object, please
return json_decode($response);
}

When you run this code, Linkedin authorization screen will open as shown below :

Hope you like this post……..Please Comment....!!!!!!

Originally posted at Mycodestock.