LinkedIn API Client with OAuth 2 authorization written on PHP

Installation

You will need at least PHP 7.3. We match officially supported versions of PHP.

Use composer package manager to install the lastest version of the package:

composer require pmg/linkedin-api-php-client

Or add this package as dependency to composer.json.

Get Started

Before you will get started, play visit to LinkedIn API Documentation. This will save you a lot of time and prevent some silly questions.

To start working with LinkedIn API, you will need to get application client id and secret.

Go to LinkedIn Developers portal and create new application in section My Apps. Once your app has been approved, you will get a ClientId and ClientSecret, that you will use later.

Bootstrapping autoloader and instantiating a client

// ... please, add composer autoloader first
include_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';

// import client class
use LinkedIn\Client;

// instantiate the Linkedin client
$client = new Client(
    'YOUR_LINKEDIN_APP_CLIENT_ID',
    'YOUR_LINKEDIN_APP_CLIENT_SECRET'
);

Getting local redirect URL

To start linking process you have to setup redirect url. You can set your own or use current one. SDK provides you a getRedirectUrl() helper for your convenience:

$redirectUrl = $client->getRedirectUrl();

We recommend you to have it stored during the linking session because you will need to use it when you will be getting access token.

Setting local redirect URL

Set a custom redirect url use:

$client->setRedirectUrl('http://your.domain.tld/path/to/script/');

Getting LinkedIn redirect URL

In order of performing OAUTH 2.0 flow, you should get LinkedIn login URL. During this procedure you have to define scope of requested permissions.

You can read more about Linkedin Api scopes here.

Use Scope enum class to get scope names. To get redirect url to LinkedIn, use the following approach:

use LinkedIn\Scope;

// define scope
$scopes = [
  Scope::READ_LITE_PROFILE,
  Scope::READ_EMAIL_ADDRESS,
  Scope::SHARE_AS_USER,
  Scope::SHARE_AS_ORGANIZATION,
];
$loginUrl = $client->getLoginUrl($scopes); // get url on LinkedIn to start linking

Now you can take user to LinkedIn. You can use link or rely on Location HTTP header.

Getting Access Token

To get access token use (don't forget to set redirect url)

$accessToken = $client->getAccessToken($_GET['code']);

This method returns object of LinkedIn\AccessToken class. You can store this token in the file like this:

file_put_contents('token.json', json_encode($accessToken));

This way of storing tokens is not recommended due to security concerns and used for demonstration purpose. Please, ensure that tokens are stored securely.

Setting Access Token

You can use method setAccessToken() for the LinkedIn\Client class to set token stored as string. You have to pass instance of LinkedIn\AccessToken to this method.

use LinkedIn\AccessToken;
use LinkedIn\Client;

// instantiate the Linkedin client
$client = new Client(
    'LINKEDIN_APP_CLIENT_ID',
    'LINKEDIN_APP_CLIENT_SECRET'
);

// load token from the file
$tokenString = file_get_contents('token.json');
$tokenData = json_decode($tokenString, true);
// instantiate access token object from stored data
$accessToken = new AccessToken($tokenData['token'], $tokenData['expiresAt']);

// set token for client
$client->setAccessToken($accessToken);

Performing API calls

All API calls can be called through simple method:

$profile = $client->api(
    'ENDPOINT',
    ['parameter name' => 'its value here'],
    'HTTP method like GET for example'
);

There are 3 helper methods:

// get method
$client->get('ENDPOINT', ['param' => 'value']);

//post
$client->post('ENDPOINT', ['param' => 'value']);

// delete
$client->delete('ENDPOINT');

Examples

Perform api call to get profile information

$profile = $client->get(
    'me',
    ['fields' => 'id,firstName,lastName']
);
print_r($profile);

List companies where you are an admin

$profile = $client->get(
    'organizationalEntityAcls',
    ['q' => 'roleAssignee']
);
print_r($profile);

Get Company page profile

$companyId = '123'; // use id of the company where you are an admin
$companyInfo = $client->get('organizations/' . $companyId);
print_r($companyInfo);

Setup custom API request headers

Change different headers sent to LinkedIn API.

$client->setApiHeaders([
  'Content-Type' => 'application/json',
  'x-li-format' => 'json',
  'X-Restli-Protocol-Version' => '2.0.0', // use protocol v2
  'x-li-src' => 'msdk' // set a src header to "msdk" to mimic a mobile SDK
]);

Change default API root

Some private API access there.

$client->setApiRoot('https://api.linkedin.com/v2/');