Warning: Undefined variable $db_link in /home/.sites/10/site5622882/web/unger/ikt22-25/kirval.fatmanur/php/DB Verbindung/test_db_verbindunbg.php on line 14

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/.sites/10/site5622882/web/unger/ikt22-25/kirval.fatmanur/php/DB Verbindung/test_db_verbindunbg.php:14
Stack trace:
#0 /home/.sites/10/site5622882/web/unger/ikt22-25/kirval.fatmanur/php/DB Verbindung/test_db_verbindunbg.php(14): mysqli_query(NULL, 'SELECT * FROM t...')
#1 {main}
  thrown in /home/.sites/10/site5622882/web/unger/ikt22-25/kirval.fatmanur/php/DB Verbindung/test_db_verbindunbg.php on line 14