PHP MySQL expects mysqli boolean given

Question

I have a php script that changes a database when the page is requested. Here is the php:

Answer 1

Line 3

$con=mysqli_connect("server","db","user","password");//establish connection

Change "server" to your host address or maybe "localhost"

my assumption is your database name = "db" , your user = "user" and user's password = "password"

if not just change into correct db name, user and password