store a variable in session and echo that variable on a page wordpress

Sure! Here is a response:

To store a variable in session and echo that variable on a WordPress page, you can follow these steps:

Step 1: Start by adding the following code to your theme's functions.php file to start a session:

add_action('init', 'start_session');
function start_session() {
    if( !session_id() ) {
        session_start();
    }
}

Step 2: Then store the variable in the session:

$_SESSION['my_variable'] = 'Your variable value';

Step 3: Finally, you can echo the variable on a page by adding this code where you want the variable to be displayed:

<?php echo $_SESSION['my_variable']; ?>

Make sure to use these steps in a child theme or a custom plugin to keep your changes separate from the theme's core files.