Warning: Undefined variable $conn in C:\Duemila\WEBSHOP\controllo_accesso_php.php on line 100

Fatal error: Uncaught Error: Call to a member function query() on null in C:\Duemila\WEBSHOP\controllo_accesso_php.php:100 Stack trace: #0 C:\Duemila\WEBSHOP\index.php(5): include() #1 {main} thrown in C:\Duemila\WEBSHOP\controllo_accesso_php.php on line 100