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Passing options to unserialize

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Is this a mistake in the documentation?  I am running PHP7.4 and get warning: unserialize() expects parameter 2 to be array, bool given.


Either an array of class names which should be accepted, false to accept no classes, or true to accept all classes. If this option is defined and unserialize() encounters an object of a class that isn't to be accepted, then the object will be instantiated as __PHP_Incomplete_Class instead. Omitting this option is the same as defining it as true: PHP will attempt to instantiate objects of any class.


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