   #PHP Manual Classes and Objects Serializing objects - objects in
   sessions References inside the constructor

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The magic functions __sleep and __wakeup

   serialize() checks if your class has a function with the magic name
   __sleep. If so, that function is being run prior to any serialization.
   It can clean up the object and is supposed to return an array with the
   names of all variables of that object that should be serialized.

   The intended use of __sleep is to close any database connections that
   object may have, committing pending data or perform similar cleanup
   tasks. Also, the function is useful if you have very large objects
   which need not be saved completely.

   Conversely, unserialize() checks for the presence of a function with
   the magic name __wakeup. If present, this function can reconstruct any
   resources that object may have.

   The intended use of __wakeup is to reestablish any database
   connections that may have been lost during serialization and perform
   other reinitialization tasks.
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