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SET, GET AND UNSET SESSION VARIABLES IN PHP

Session is a way to store information across multiple pages in a website.

How to start a session:
A session can be started  by using session_start() function.We can set session variable by using PHP global variable $_SESSION.
consider an example:
create a new page demo1.php and start a new PHP session in this page and set some session variables.
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<?php

// Start the session
session_start ();
?>
<!DOCTYPE html>
<html>
<body>

<?php

// Set session variables
$_SESSION ["username"] = "sowmya";
$_SESSION ["email"] = "sowmya.vejerla@gmail.com";
echo 'username : ' . $_SESSION ['username'];
echo '<br>';

echo 'email :  ' . $_SESSION ['email'];

?>

</body>
</html>
Next we create another page demo2.php ,from this page we will access  the session variables that we set in demo1.php page.
Generally session variables can't be accesses directly so we need to start the session again in this page. 
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<?php

// Start the session
session_start();
?>
<!DOCTYPE html>
<html>
<body>

<?php

//access session variable
echo $_SESSION['username'];
echo '<br>';
//update session variable
$_SESSION['email'] = "vejerla.sowmya@gmail.com";
echo  $_SESSION['email'];

//unset a session variable
unset($_SESSION['username']);

//remove all session variables
session_unset();

//destroy the session
session_destroy();

?>





Outputs:








demo1 output









demo2 output




This is how session will be implemented. Session is mostly used for storing user-specific data for a limited period of time (for example across user login to logout) namely a single session.

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