source: branches/2.0/header.session.inc.php @ 2582

<?php
        if ( isset( $_COOKIE[ 'sessionid' ] ) )
                session_id( $_COOKIE[ 'sessionid' ] );

        session_start( );

        $sess = $_SESSION[ 'phpgw_session' ];
        $user_ip =  (isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR']);  
        $connection_id = "{$sess['session_id']}{$user_ip}".substr($_SERVER[ 'HTTP_USER_AGENT' ],0,199);


        if (empty($_SESSION['phpgw_session']['session_id']) || ($_SESSION['connection_db_info']['user_auth'] && implode('',$_SESSION['connection_db_info']['user_auth']) !== $connection_id))
        {
                if($_SESSION['connection_db_info']['user_auth'] && !strstr($_SERVER['SCRIPT_URL'],"/controller.php")) {
                        error_log( '[ INVALID SESSION ] >>>>' . implode('',$_SESSION['connection_db_info']['user_auth']) . '<<<< - >>>>' . $connection_id . '<<<<', 0 );
                        @require_once dirname( __FILE__ ) . '/logout.php';
                }

                setcookie(session_name(),"",0); // Removing session cookie.
                unset($_SESSION);                               // Removing session values.
                // From ExpressoAjax response "nosession"
                if(strstr($_SERVER['SCRIPT_URL'],"/controller.php")){
                        echo serialize(array("nosession" => true));
                        exit;
                }
        }
        else{
                // From ExpressoAjax update session_dla (datetime last access). 
                if(strstr($_SERVER['SCRIPT_URL'],"/controller.php"))
                        $_SESSION['phpgw_session']['session_dla'] = time();
        }
?>