https://www.ibleeu.com/index.php?g=&m=article&a=index&id=9

调用完这个函数后你的session操作就变成是用自定义的类的方法了，所以是你说的那样的应该

session_set_save_handler(
    array($sessHandler, '_open'),
    array($sessHandler, '_close'),
    array($sessHandler, '_read'),
    array($sessHandler, '_write'),
    array($sessHandler, '_destroy'),
    array($sessHandler, '_clean')
);