PHP Code to connect and list record

<?php
//database connect
$db=mysqli_connect("localhost","root","","mycompanyhr");

  //checking database connection
if ($db==false) {
  echo "Connect failed: ";
echo mysqli_connect_error($db);
  exit();
}
else {
  echo "Connection successful";
}

$sql="select EMPNO, FIRSTNAME, LASTNAME, WORKDEPT,
        PHONENO from employee";

$rs=mysqli_query($db, $sql);
if($rs==false){
  echo ("Query cannot be executed!<br>");
  echo ("SQL Error : ".mysqli_error($db));
}
else {
  while($rekod=mysqli_fetch_array($rs)){
    echo $rekod['EMPNO']."<br>";
    echo $rekod['FIRSTNAME']."<br>";
    echo $rekod['LASTNAME']."<br>";
    echo $rekod['WORKDEPT']."<br>";
    echo $rekod['PHONENO']."<hr>";
  }
}
?>