Basic Example - Garethp/php-ews GitHub Wiki

$api = API::withUsernameAndPassword($server, $username, $password);

$start = new DateTime('8:00 AM');
$end = new DateTime('9:00 AM');

$request = array(
    'Items' => array(
        'CalendarItem' => array(
            'Start' => $start->format('c'),
            'End' => $end->format('c'),
            'Body' => array(
                'BodyType' => Enumeration\BodyTypeType::HTML,
                '_value' => 'This is <b>the</b> body'
            ),
            'ItemClass' => Enumeration\ItemClassType::APPOINTMENT,
            'Sensitivity' => Enumeration\SensitivityChoicesType::NORMAL,
            'Categories' => array('Testing', 'php-ews'),
            'Importance' => Enumeration\ImportanceChoicesType::NORMAL
        )
    ),
    'SendMeetingInvitations' => Enumeration\CalendarItemCreateOrDeleteOperationType::SEND_TO_NONE
);

$request = Type::buildFromArray($request);
$response = $api->getClient()->CreateItem($request);