Using PHP Sessions in WordPress

I’ve spent a bit of time sorting out the use of PHP sessions in WordPress. I’ve posted a discussion of the issues on my blog at http://devondev.com/2012/02/03/using-the-php-session-in-wordpress/

For those who just want the bottom line here it is. Put the following code in your plugin or theme code:

add_action('init', 'myStartSession', 1);
add_action('wp_logout', 'myEndSession');
add_action('wp_login', 'myEndSession');

function myStartSession() {
    if(!session_id()) {
        session_start();
    }
}

function myEndSession() {
    session_destroy ();
}

Do not put the session_start in wp-config.php if there is any chance that register_globals is set in your PHP system.

/peter