<?php include_once("db.php")
     session_start();
     ?>

    <?php
$user = $_POST['name'];
$pass = $_POST['pwd'];

 $sql="SELECT count(*) from phplogin WHERE(username='$user' and password='$pass')";

$query = mysql_query($sql);

$result = mysql_fetch_array($query);

if($result[0] > 0) {
    $_SESSION['userName']=$user;
    echo "Succesful login!";

    echo "<br /> Welcome " .$_SESSION['userName']. "!";
    echo "<br /><a href='signupform.php' > SignUp </a>";
    echo "<br /><a href='signinform.php' > SignIn </a>";
    echo "<br /><a href='logout.php' > LogOut </a>";
}
else{
echo "Login failed!";
echo "<br /><a href='signupform.php' > SignUp </a>";
echo "<br /><a href='signinform.php' > SignIn </a>";

}
?>

<?php
   include_once("db.php"); // Added the missing semi-colon
   session_start();
?>

<?php include_once("db.php") ;//semi-colon was missing
     session_start();
     ?>

<?php include_once("db.php");
 session_start();
 ?>