Mauryashubham/header.php

## header.php
<nav class="navbar navbar-inverse" style="border-radius: 0px;">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand" href="#">Your WebSite Name</a>
    </div>
    <ul class="nav navbar-nav">
      <li class="active"><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
    </ul>
    <ul class="nav navbar-nav navbar-right">
    <?php  if(!$_SESSION['admin']) {?>
      <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
      <?php } else { ?>
         <li><a href="#">Welcome, <?php echo $_SESSION['admin'];?></a></li>
         <?php } ?>
    </ul>
  </div>
</nav>

## index.php
<?php

/**
@author : Shubham Maurya,
Email id : maurya.shubham5@gmail.com
**/
session_start();
//error_reporting(0);

if(isset($_POST['login']))
{
$name=$_POST['name'];
$pass=$_POST['pass'];

if($name=="admin" & $pass=="admin")
{
$_SESSION['admin']=$name;
//echo "Welcome, ".$_SESSION['admin'];
header("location:welcome.php");
}

}

?>

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Case</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>


</head>
<body>
  <?php @include 'header.php' ?>

 <form  method="post">

    <input type="text" placeholder="Enter Username" name="name" required>

    <input type="password" placeholder="Enter Password" name="pass" required>

    <button type="submit" name="login">Login</button>
</form>


</body>
</html>

## welcome.php
<?php

/**
@author : Shubham Maurya,
Email id : maurya.shubham5@gmail.com
**/

session_start();
?>
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<?php @include 'header.php' ?>
welcome
</body>
</html>
	<?php

	/**
	@author : Shubham Maurya,
	Email id : maurya.shubham5@gmail.com
	**/
	session_start();
	//error_reporting(0);

	if(isset($_POST['login']))
	{
	$name=$_POST['name'];
	$pass=$_POST['pass'];

	if($name=="admin" & $pass=="admin")
	{
	$_SESSION['admin']=$name;
	//echo "Welcome, ".$_SESSION['admin'];
	header("location:welcome.php");
	}

	}

	?>

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>Bootstrap Case</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>


	</head>
	<body>
	<?php @include 'header.php' ?>

	<form method="post">

	<input type="text" placeholder="Enter Username" name="name" required>

	<input type="password" placeholder="Enter Password" name="pass" required>

	<button type="submit" name="login">Login</button>
	</form>


	</body>
	</html>