Login page code in PHP

 (1)first create file index.html


<form action="login.php"  method="post">
                     <span class="loginText">User name:</span><br>
                                         <input name="username" type="TEXT"><br>
                                         <span class="loginText">Password:</span><br>
                                         <input name="Password" type="PASSWORD">
                                         <br>
                                         <span class="loginText">login as user: <i>demo</i><br>with password: <i>anahaw</i></span>
                                        </td>
                                    </tr>

                                    <tr>
                                        <td align="right"><input value="submit" name="SubmitUser" type="submit"></td>
                                        </form>

(2)create login.php file

<?php

$username=$_POST['username'];
$password=$_POST['Password'];
$con=mysql_connect("localhost","root","") or die(mysql_error());

mysql_select_db("payroll",$con);

$sql="select username,password  from login where username='$username'  AND password='$password'";

$result=mysql_query($sql) or die(mysql_error());

$num=mysql_num_rows($result) or die(mysql_error());


if($num>0)
{
 session_start();
 $_SESSION['username']=$username;
header("Location:welcome.php");

}

else
{
echo "invalid login";
}

?>