ClearCacheService.php

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<?php
namespace TYPO3\CMS\Install\Service;

use TYPO3\CMS\Core\Utility\GeneralUtility;

class ClearCacheService {

    protected $objectManager = NULL;

    public function clearAll() {
        // Delete typo3temp/Cache
        GeneralUtility::flushDirectory(PATH_site . 'typo3temp/Cache', TRUE, TRUE);

        $bootstrap = \TYPO3\CMS\Core\Core\Bootstrap::getInstance();
        $bootstrap->unregisterClassLoader();

        \TYPO3\CMS\Core\Cache\Cache::flagCachingFrameworkForReinitialization();

        $bootstrap
            ->initializeClassLoader()
            ->initializeCachingFramework()
            ->initializeClassLoaderCaches()
            ->initializePackageManagement('TYPO3\\CMS\\Core\\Package\\PackageManager');

        // Get all table names starting with 'cf_' and truncate them
        $database = $this->getDatabaseConnection();
        $tables = $database->admin_get_tables();
        foreach ($tables as $table) {
            $tableName = $table['Name'];
            if (substr($tableName, 0, 3) === 'cf_') {
                $database->exec_TRUNCATEquery($tableName);
            } elseif ($tableName === 'cache_treelist') {
                // cache_treelist is not implemented in the caching framework.
                // clear this table manually
                $database->exec_TRUNCATEquery('cache_treelist');
            }
        }

        // From this point on, the code may fatal, if some broken extension is loaded.

        // Use bootstrap to load all ext_localconf and ext_tables
        $bootstrap
            ->loadTypo3LoadedExtAndExtLocalconf(FALSE)
            ->applyAdditionalConfigurationSettings()
            ->initializeTypo3DbGlobal()
            ->loadExtensionTables(FALSE);

        // The cache manager is already instantiated in the install tool
        // with some hacked settings to disable caching of extbase and fluid.
        // We want a "fresh" object here to operate on a different cache setup.
        // cacheManager implements SingletonInterface, so the only way to get a "fresh"
        // instance is by circumventing makeInstance and/or the objectManager and
        // using new directly!
        $cacheManager = new \TYPO3\CMS\Core\Cache\CacheManager();
        $cacheManager->setCacheConfigurations($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']);
        // Cache manager needs cache factory. cache factory injects itself to manager in __construct()
        new \TYPO3\CMS\Core\Cache\CacheFactory('production', $cacheManager);

        $cacheManager->flushCaches();
    }

    protected function getDatabaseConnection() {
        static $database;
        if (!is_object($database)) {
            $database = $this->objectManager->get('TYPO3\\CMS\\Core\\Database\\DatabaseConnection');
            $database->setDatabaseUsername($GLOBALS['TYPO3_CONF_VARS']['DB']['username']);
            $database->setDatabasePassword($GLOBALS['TYPO3_CONF_VARS']['DB']['password']);
            $database->setDatabaseHost($GLOBALS['TYPO3_CONF_VARS']['DB']['host']);
            $database->setDatabasePort($GLOBALS['TYPO3_CONF_VARS']['DB']['port']);
            $database->setDatabaseSocket($GLOBALS['TYPO3_CONF_VARS']['DB']['socket']);
            $database->setDatabaseName($GLOBALS['TYPO3_CONF_VARS']['DB']['database']);
            $database->initialize();
            $database->connectDB();
        }
        return $database;
    }
}