Fatal error: Uncaught Error: Undefined constant "DB_USERNAME" in /home/acagriba/public_html/db_config.php:7 Stack trace: #0 /home/acagriba/public_html/tum_kisiler.php(5): require_once() #1 {main} thrown in /home/acagriba/public_html/db_config.php on line 7