Fatal error: Uncaught Error: Undefined class constant 'MYSQL_ATTR_USE_BUFFERED_QUERY' in /var/www/web/includes/database/mysql/database.inc:332 Stack trace: #0 /var/www/web/includes/database/database.inc(1796): DatabaseConnection_mysql->__construct(Array) #1 /var/www/web/includes/database/database.inc(1582): Database::openConnection('default', 'default') #2 /var/www/web/includes/bootstrap.inc(3550): Database::getConnection('default', 'default') #3 /var/www/web/includes/bootstrap.inc(3472): _registry_check_code('class', 'Redis') #4 [internal function]: drupal_autoload_class('Redis') #5 /var/www/web/sites/all/modules/redis/lib/Redis/Client/PhpRedis.php(9): spl_autoload_call('Redis') #6 /var/www/web/sites/all/modules/redis/lib/Redis/Client/Manager.php(142): Redis_Client_PhpRedis->getClient(Array) #7 /var/www/web/sites/all/modules/redis/lib/Redis/Client/Manager.php(85): Redis_Client_Manager->createClient('default') #8 /var/www/web/sites/all/modules/redis/lib/Redis/Client.php(213): Redis_Client_Manager->getClient() #9 /var/www/ in /var/www/web/includes/database/mysql/database.inc on line 332