ohmy-auth Yammer

yammer.php

<?php

require_once __DIR__ . '/vendor/autoload.php';

use ohmy\Auth2;

# do 3-legged oauth
$yammer = Auth2::legs(3)
    # configuration
    ->set(array(
        'client_id'       => '{yammer-clientid}',
        'secret'   => '{yammer-clientsecret}',
        'redirect_uri' => '{yammer-redirecturi}'
    ))
    # oauth flow
    ->authorize('https://www.yammer.com/dialog/oauth')
    ->access('https://www.yammer.com/oauth2/access_token.json')
    ->finally(function($data) use(&$access_token) {
        $access_token = $data['access_token']['token'];
    });

# access Yammer api
$yammer->GET("https://www.yammer.com/api/v1/users.json", array(), array('User-Agent' => 'ohmy-auth', 'Authorization' => 'Bearer ' . $access_token))
    ->then(function($data) {
        echo '<pre>';
        var_dump($data->json());
        echo '</pre>';
    });

Requires the ohmy-auth library: https://github.com/sudocode/ohmy-auth