Contao\CoreBundle\Framework\ContaoFramework::initializeFramework PHP Method

    private function initializeFramework()
    {
        // Set the error_reporting level
        error_reporting($this->errorLevel);
        $this->includeHelpers();
        $this->includeBasicClasses();
        // Set the container
        System::setContainer($this->container);
        /** @var Config $config */
        $config = $this->getAdapter(Config::class);
        // Preload the configuration (see #5872)
        $config->preload();
        // Register the class loader
        ClassLoader::scanAndRegister();
        $this->initializeLegacySessionAccess();
        $this->setDefaultLanguage();
        // Fully load the configuration
        $config->getInstance();
        $this->validateInstallation();
        Input::initialize();
        TemplateLoader::initialize();
        $this->setTimezone();
        $this->triggerInitializeSystemHook();
        $this->handleRequestToken();
    }