Hi There,
In this tutorial you will learn how to manage session in php.
What is session?
Sessions are a simple way to store data for individual users against a unique session ID.
This can be used to persist state information between page requests. Session IDs are normally
sent to the browser via session cookies and the ID is used to retrieve existing session data.
The absence of an ID or session cookie lets PHP know to create a new session, and generate a new
session ID.
when you start session in php it will store in tmp folder.
A session is started with the session_start() function.
Session variables are set with the PHP global variable: $_SESSION.
PHPSESSID is an auto generated session cookie by the server which contains a random long number which is given out by the server itself.
I will show a simple example to understand session management.
Step1: Create index.php and copy paste below
index.php contains simple login form and session.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<?php
session_start();
if(isset($_SESSION['name'])){
echo "Welcome ".$_SESSION['name'];
echo '<br>';
echo '<a href="logout.php">Logout</a>';
}else{?>
<form action="logging.php" method="post" enctype="application/x-www-form-urlencoded">
<input type="text" name="username" placeholder="username" /><br />
<input type="password" name="password" placeholder="password" /><br />
<input type="submit" name="submit" value="Login" />
</form>
<?php } ?>
<script>
<?php
if(isset($_GET['msg'])){
?>
alert('<?php echo $_GET['msg']; ?>');
<?php
}
?>
</script>
</body>
</html>
Step2: Create logging.php and copy paste below
logging.php file contains session and login authentication
<?php
ob_start();
if(isset($_POST['submit'])){
$username = trim($_POST['username']);
$password = trim($_POST['password']);
if($username == "admin" && $password == "pass"){
session_start();
$_SESSION['name']= $username;
header("Location: index.php?msg=Loggedin successfull");
}else{
header("Location: index.php?msg=Invalid Username or Password");
}
}
?>
Step2: Create logout.php and copy paste below
<?php
session_start();
if(isset($_SESSION['name'])){
unset($_SESSION['name']);
session_destroy();
header("Location: index.php?msg=Loggedout successfully");
}
?>
Happy Coding!
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