Pimcore\ExtensionManager::enable PHP Method

    public static function enable($type, $id)
    {
        $config = self::getConfig();
        if (!isset($config->{$type})) {
            $config->{$type} = new \Zend_Config([], true);
        }
        $config->{$type}->{$id} = true;
        self::setConfig($config);
        // call enable.php inside the extension
        $extensionDir = self::getPathForExtension($id, $type);
        $enableScript = $extensionDir . "/enable.php";
        if (is_file($enableScript)) {
            include $enableScript;
        }
    }