How can sessions be used to store and retrieve values in a PHP application?

Sessions can be used to store and retrieve values in a PHP application by setting session variables. These variables can be accessed across different pages within the same session, allowing data to be stored temporarily and retrieved when needed. To use sessions, you need to start the session at the beginning of your PHP script using session_start() function, and then set session variables using $_SESSION['key'] = 'value'. To retrieve the stored value, simply access the session variable using $_SESSION['key']. 

<?php
// Start the session
session_start();

// Set session variable
$_SESSION['username'] = 'JohnDoe';

// Retrieve session variable
$username = $_SESSION['username'];
echo $username; // Output: JohnDoe
?>

Keywords

sessions PHP store retrieve values

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