What is difference between __sleep and __wakeup()?

What is difference between sleep and wakeup()?

Answer»

_sleep()	_wakeup()
It is USED to return the ARRAY of all the VARIABLES which NEED to be saved.	It is used to retrieve all the arrays RETURNED by the _sleep() command.
It is executed before the serialize() command.	Is executed before the unserialize() command.