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This article mainly introduces the example analysis based on object-oriented design in PHP, which is very detailed and has certain reference value. Friends who are interested must finish it!

Public represents the global, and all the internal and external subclasses of the class can access it.

The code is as follows:

Public

Private means private, and can only be used within this class

The copy code is as follows:

Private

Protected means protected and can only be accessed in this class or subclass or parent class; magic methods related to encapsulation:

_ _ set (): is the method that is automatically called when the property value of a private member is set directly

_ _ get (): is the method that is automatically called when the property value of a private member is directly obtained.

_ _ isset (); this method is called automatically when you directly isset to see if private properties are stored in the object.

_ _ unset (); is the method that is automatically called when the private property is deleted by unset directly.

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