As I journey though my life as a professional web developer (and software developer), I encounter more and more of user login and session maintenance topics. It applies to all webpages these days be it in any platform; ASP.NET, JSP, PHP, PERL. There are tonnes of example, description, explanations and lecture notes out there, but the purpose of this note is not to get very academic but to give all you programmers a quick way to get start with a working example. So for the benefit of all new and experienced programmers alike, here are the steps in creating a login session based explanation and example codes.
Enjoy!
The Demo
Here is the link to the demo.
And here is are the codes in zip file.
The Codes
login.php : The “login.php” file the login screen
<?php
// Begins the session, you need to say this at the top of a page or
// before you call session code
// Note that, you will need this statement all the time
session_start();
// Checking whether the session is already there or not if true
// then header redirect it to the home page directly
if(isset($_SESSION['use']))
{
header("Location:home.php");
}
if(isset($_POST['login'])) // Checks if user clicked login button
{
// Get value from encoded URL (POST)
$user = $_POST['user'];
$pass = $_POST['pass'];
// Check for valid username and password (valid username
// and password for this example is claire and iknoweverythng)
if($user == "claire" && $pass == "iknoweverything")
{
// Store username in session variable
$_SESSION['use']=$user;
// On successful login redirects to home.php
echo '<script type="text/javascript">';
echo ' window.open("home.php","_self");';
echo '</script>';
}
else
{
echo "Invalid username and/or password";
}
}
?>
<html>
<head>
<title>Login Page</title>
</head>
<body>
<form action="" method="post">
<table width="200" border="0">
<tr>
<td>UserName</td>
<td>
<input type="text" name="user">
</td>
</tr>
<tr>
<td>Password</td>
<td>
<input type="password" name="pass">
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="login" value="login">
</td>
</tr>
</table>
</form>
</body>
</html>
home.php : The “home.php” file is for homepage (the main landing page).
<?php
// Begins the session, you need to say this at the top of a page or
// before you call session code
// Note that, you will need this statement all the time
session_start();
?>
<html>
<head>
<title>Home</title>
</head>
<body>
<?php
// If session is not set then redirect to login Page
if(!isset($_SESSION['use']))
{
header("Location:Login.php");
}
echo $_SESSION['use'];
echo "<br>";
echo "Login Successful";
echo "<a href='logout.php'> Logout</a> ";
?>
</body>
</html>
logout.php : The “logout.php” file logs your user out of the session.
<?php
session_start();
echo "Logout Successfully";
session_destroy(); // Destroys the session
header("Location: login.php");
?>