What is the correct way to define and manipulate session variables in PHP?

To define and manipulate session variables in PHP, you need to start the session using session_start() at the beginning of your PHP script. You can then set session variables using the $_SESSION superglobal array, like $_SESSION['variable_name'] = 'value'. To manipulate session variables, you can update their values or unset them as needed. 

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

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

// Update a session variable
$_SESSION['username'] = 'JaneSmith';

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

Keywords

session variables PHP define manipulate error types

Related Questions