index.php

<?php
include 'login.php';
?>
<!DOCTYPE html>
<html>
<head>
    <title>Login Form in PHP with Session</title>
    <link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<div id="main">
    <h1>PHP Login Session Example</h1>

    <div id="login">
        <h2>Login Form</h2>

        <form action="" method="post">
            <table>
                <tr>
                    <td>
                        <label form="name">UserName :</label>
                    </td>
                    <td>
                        <input id="name" name="username" placeholder="username" type="text">
                    </td>
                </tr>
                <tr>
                    <td>
                        <label for="password">Password :</label>
                    </td>
                    <td>
                        <input id="password" name="password" placeholder="**********" type="password">
                    </td>
                </tr>
                <tr>
                    <td colspan="2" align="center">
                        <input type="hidden" name="login" value="1">
                        <input name="submit" type="submit" value="Login">
                    </td>
                </tr>
                <tr>
                    <td colspan="2" align="center">
                        <span><?= $error; ?></span>
                    </td>
                </tr>
            </table>

        </form>
    </div>
</div>
</body>
</html>