How can the ownCloud API be utilized in PHP to interact with calendar entries and the database?

To interact with calendar entries and the database using the ownCloud API in PHP, you can utilize the ownCloud Calendar app API endpoints to create, update, delete, and retrieve calendar entries. You can also use the ownCloud database API to interact with the database to store and retrieve calendar data.

// Example code to interact with ownCloud Calendar entries and database

// Include ownCloud API
require_once 'path/to/owncloud/lib/base.php';

// Authenticate user
OC_User::login('username', 'password');

// Create a new calendar entry
$calendar = OC_Calendar_App::createCalendar('My Calendar');
$event = OC_Calendar_App::newEvent();
$event->setSummary('Meeting');
$event->setStart(new DateTime('2022-01-01 10:00:00'));
$event->setEnd(new DateTime('2022-01-01 11:00:00'));
$calendar->createEvent($event);

// Retrieve calendar entries
$calendarEntries = OC_Calendar_App::getCalendar('My Calendar')->getEvents();

// Connect to ownCloud database
$db = \OC::$server->getDatabaseConnection();

// Insert calendar data into database
$db->insertIfNotExist('calendar_entries', [
    'summary' => 'Meeting',
    'start' => '2022-01-01 10:00:00',
    'end' => '2022-01-01 11:00:00'
]);

// Retrieve calendar data from database
$query = $db->getQueryBuilder();
$query->select('*')->from('calendar_entries');
$result = $db->executeQuery($query);
$calendarData = $result->fetchAll();