PHP object-oriented basic learning, PHP object-oriented Learning
What is an object?
All things in the world are objects (they can be visible or abstract concepts)
Basic composition of Objects
1. Elements (attributes) of Objects)
2. Object behavior (method)
Object Features:
1. Every object is unique
2. An object is a specific thing. Its function is to complete a specific function,
3. objects can be reused.
Why object-oriented
1. The object description method is closer to the real world and is conducive to the understanding of large businesses.
The essence of object-oriented
1. Object-oriented means to store (attributes and methods) the problems to be solved in life in the way of objects)
2. Call methods between objects to complete interaction
Basic Idea of object-oriented
Step 1: recognize objects
Step 2: Identify object attributes
Step 3: Identify object behavior
Basic object-oriented principles
1. The object is highly cohesive.
2. objects are low-coupling externally.
