try {
    $client = new SPOClient($url);
    $client->signIn($username,$password);
    echo 'You have authenticated successfullyn';
}
catch (Exception $e) {
    echo 'Connection failed: ',  $e->getMessage(), "n";
}

require_once 'SPOClient.php';

$username = 'username@tenant.onmicrosoft.com';
$password = 'password';
$url = "https://tenant.sharepoint.com/";

createTask($url,$username,$password);

function createTask($url,$username,$password){
    $client = new SPOClient($url);
    $client->signIn($username,$password);
    $listTitle = 'Tasks';
    $list = $client->getList($listTitle);
    $itemProperties = array('Title' => 'Order Approval', 'Body' => 'Order approval task');
    $item = $list->addItem($itemProperties);
}