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只有在用 sess_destroy 的才会删除 session生成的file 文件。    怎么样在关闭浏览器的时候  也同事删除   sess_expiration 已经设置成 0了 
 
$config['sess_driver'] = 'files'; 
$config['sess_cookie_name'] = 'ci_session'; 
$config['sess_expiration'] = 0; 
$config['sess_save_path'] = FCPATH.'runtime'; 
$config['sess_match_ip'] = FALSE; 
$config['sess_time_to_update'] = 10; 
$config['sess_regenerate_destroy'] = false; 
 
 
求大神~~~ 
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