<?php

use Opensoft\Tfs\Rest\Client;

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

$client = new Client(
    // your tfs/vso
    'https://opensoft.visualstudio.com',
    // your collection
    'AcmeApp',
    // (optional) raw options to pass to guzzle (ntlm example here)
    [                                      
        'curl' => [
            CURLOPT_HTTPAUTH => CURLAUTH_NTLM, 
            CURLOPT_USERPWD => 'username:password'
        ]
    ]
);

// retrieve a work item by its ID
$response = $client->workItemTracking()->getWorkItem(12345);

// get the result as an array
print_r($response->asArray());

// follow hypermedia links
$response = $response->follow('workItemHistory');

print_r($response->asArray());