Method getCoreExtensionIds

/**
 * Returns an array of core extension IDs.
 *
 * @return  array
 *
 * @since   4.0.0
 * @throws  \RuntimeException
 */
public static function getCoreExtensionIds()
{
    if (self::$coreExtensionIds !== null) {
        return self::$coreExtensionIds;
    }
    $db = Factory::getDbo();
    $query = $db->getQuery(true)->select($db->quoteName('extension_id'))->from($db->quoteName('#__extensions'));
    foreach (self::$coreExtensions as $extension) {
        $values = $query->bindArray($extension, [ParameterType::STRING, ParameterType::STRING, ParameterType::STRING, ParameterType::INTEGER]);
        $query->where('(' . $db->quoteName('type') . ' = ' . $values[0] . ' AND ' . $db->quoteName('element') . ' = ' . $values[1] . ' AND ' . $db->quoteName('folder') . ' = ' . $values[2] . ' AND ' . $db->quoteName('client_id') . ' = ' . $values[3] . ')', 'OR');
    }
    $db->setQuery($query);
    self::$coreExtensionIds = $db->loadColumn();
    return self::$coreExtensionIds;
}