Warning: Undefined variable $connectdb in /htdocs/config.php on line 8

Fatal error: Uncaught ArgumentCountError: mysqli_connect_errno() expects exactly 0 arguments, 1 given in /htdocs/config.php:8 Stack trace: #0 /htdocs/config.php(8): mysqli_connect_errno(NULL) #1 /htdocs/index.php(1): include_once('/htdocs/config....') #2 {main} thrown in /htdocs/config.php on line 8