listing.php basic PHP DB connection and listing data

<?php
// listing.php
//to display from table
//1. connect to database
include "connection.php";

//2. provide sql command
$sql="select EMPNO, FIRSTNAME,
    LASTNAME, PHONENO
    from employee";
//3. run the sql command to db
$qr=mysqli_query($db, $sql);

//4. fetch one record
while($rekod=mysqli_fetch_array($qr)){
//5. display record(s)
    echo "<br>";
    echo "Employee no ".$rekod['EMPNO'];
    echo "Firstname ".$rekod['FIRSTNAME'];
    echo "Lastname ".$rekod['LASTNAME'];
    echo "Phone ".$rekod['PHONENO'];
}
?>