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Chapter 13. Classes and Objects |
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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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