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Object-oriented concept is the core of object-oriented technology. In the display world, the things we face are all objects, such as computers, televisions, bicycles and so on. In object-oriented programming, an object is a whole composed of information and the description of information processing, and it is an abstraction of the real world.

The three main properties of an object

The behavior of the object: those actions can be applied to the object. Turning on and off the light is the behavior.

The shape of the object: when those methods are applied is how the object responds, color, size, appearance.

The representation of the object: the representation of the object is equivalent to the ID card, specifically distinguishing what is different in the same behavior and state.

Object-oriented model

Object-oriented concepts:

Oop (object-oriented programming) can make its code more concise, easy to maintain and have stronger reusability.

1. PHP object-oriented (3)

IV. Advanced practice of OOP

4.3 Static- static members

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