session 绑定函数
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session_set_save_handler ( callback $open ,
callback $close , callback $read , callback $write , callback $destroy ,
callback $gc )
callback $close , callback $read , callback $write , callback $destroy ,
callback $gc )
定义六个function 然后绑定到session上面.
实现session自定义函数... 比如存到数据库...