Auto logout for PHP website

Need to auto logout for PHP website when the user closes the browser or 15 minutes of inactivity. Currently for the login status, when a user logs in, it sets a value for that user in the MYSQL database to 1. When they're logged out, the value is 0. Need to add calendar side to date field so as user can chose date from that one. Need to add sound to my chat service. You can use any scripts that are available online.