    <?php session_start();
    ob_start();
     
    $con = mysql_connect("localhost","root","") OR die.('Could not connect: ' . mysql_error());
    mysql_select_db("payroll", $con);
     
    $id=$_POST['empID'];
    $pass=$_POST['empPass'];
    // To protect MySQL injection (more detail about MySQL injection)
    $id = stripslashes($id);
    $pass = stripslashes($pass);
    $id = mysql_real_escape_string($id);
    $pass = mysql_real_escape_string($pass);
     
    $sql="SELECT * FROM emplogin WHERE empID='$id' and empPass='$pass'";
    $result=mysql_query($sql);
    // Mysql_num_row is counting table row
    $count=mysql_num_rows($result);
    // If result matched $myusername and $mypassword, table row must be 1 row
    if($count==1){
    // Register $myusername, $mypassword and redirect to file "login_success.php"
    foreach($row=mysql_fetch_array($result)){
    $_SESSION["empName"] = $row[name];
    }
    $_SESSION["empID"] = $id;
    $_SESSION["empPass"] =$pass;
    header("location: empHome.php");
    }
    else {
    header("Location: empLoginError.php");
    }
    ob_end_flush();
    ?>

NOW IN empHome.php file, you can display name:

if(isset($_SESSION["empName"]))

echo "welcome: ". $_SESSION["empName"] ;