This article mainly introduces the difference between abstract classes and interfaces in PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it

The difference between abstract classes and interfaces

Abstract class:

• Single inheritance, use the extends keyword

• Can have constant and variable attributes

• Can have constructor methods

• Methods in abstract classes can use the public, static, private, and protect keywords

• The corresponding logic can be implemented in the method

• There cannot be a method body in an abstract method

Interface:

• Multiple inheritance can be achieved by using the implements or extends keywords to inherit

• You can have constants, but you cannot have variables

• No constructor method

• Methods are generally modified with the public keyword

• Only method name, no method body

• Single inheritance, using the extends keyword

• can have constant and variable attributes

• Can have constructor methods

• ##Methods in abstract classes can use public, static, private , the corresponding logic can be implemented in the protect keyword

• method

• in the abstract method There cannot be a method body

Interface:

• Can achieve multiple inheritance, use implements or extends keyword inheritance

• Can have constants, but cannot have variables

• No constructor

• Methods are generally modified using the public keyword

• Only method name, no method body

Neither abstract classes nor interfaces can be instantiated

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