NEW to mysqli_* and I need some fundamental help because this is just the first time i am migrating to mysqli_* Functions

Question

I have this code below. And I have this error:

Warning: mysqli_query() expects at least 2 parameters, 1 given

=========================================================================

$qry = mysqli_query("select * from tbl_users where usr='$unm' and pwd='$pwd'");
$rec_count = mysqli_num_rows($qry);

if($rec_count == 1){
    while($row = mysqli_fetch_array($qry)){
        echo "Welcome " . ucfirst($row['fname']) .  "!";
    }
}

Answer 1

Check the documentation. When you create the connection to your database server, that is create a link resource.

For example:

$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "my_db");

when you want to use the mysqli_query, you need to provide this $link to it.

$result = mysqli_query ( $link, $qry);