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ini_set('session.cookie_lifetime', 60 * 60 * 24 * 7);  // 7 day cookie lifetime
ini_set('session.gc_maxlifetime', 60 * 60 * 24 * 7);
ini_set('session.save_path', '/home/yoursite/sessions');

session_start();

setcookie('PHPSESSID','any id' , any time);