When you serialize an object with the serialize() function, PHP looks in the object's class for a special function named __sleep() function, which you can use to perform many of same tasks as a destructor function.

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When you serialize an object with the serialize() function, PHP looks in the object's class for a special function named __sleep() function, which you can use to perform many of same tasks as a destructor function.

When You Serialize an Object with the serialize() function, PHP