Fatal error: Uncaught Error: Undefined constant PDO::MYSQL_ATTR_INIT_COMMAND in /var/www/html/sistema/app/config.php:11 Stack trace: #0 /var/www/html/sistema/app/clientes_crud.php(4): require_once() #1 /var/www/html/sistema/index.php(207): require_once('...') #2 {main} thrown in /var/www/html/sistema/app/config.php on line 11