PHP simple initialization

app-only.php

<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Kiota\Abstractions\ApiException;
use Microsoft\Kiota\Authentication\Oauth\ClientCredentialContext;

set_include_path(__DIR__);
require 'vendor/autoload.php';

$tokenRequestContext = new ClientCredentialContext(
    'tenantID',
    'clientID',
    'clientSecret'
);
$graphServiceClient = new GraphServiceClient($tokenRequestContext);

//Get a user
try {
    $response = $graphServiceClient->users()->ByUserId('AlexW@M365x86781558.OnMicrosoft.com')->get()->wait();
    echo "Hello, I am {$response->getGivenName()}";

} catch (ApiException $ex) {
    echo $ex->getMessage();
}

delegated.php

<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Kiota\Abstractions\ApiException;
use Microsoft\Kiota\Authentication\Oauth\AuthorizationCodeContext;

set_include_path(__DIR__);
require 'vendor/autoload.php';

$tokenRequestContext = new AuthorizationCodeContext(
    'tenantID',
    'clientID',
    'value',
    'authCode',
    'redirectURI'
);
$scopes = ['User.Read'];
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);

try {
    $user = $graphServiceClient->me()->get()->wait();
    echo "Hello, I am {$user->getGivenName()}";
} catch (ApiException $ex) {
    echo $ex->getMessage();
}