PHP Object-oriented abstract class

Abstract Keywords: abstraction

Definition: There is at least one abstract method in a class, which we call abstract classes, so abstract classes are based on abstract methods, and abstract classes are defined first to define abstract methods.

Abstract class person{    abstract function name ();    .......}

1. An abstract method must be in an abstract class

2. Abstract methods cannot be added {}

3. Abstract method in front of the add abstract

Features of abstract classes:

1. Abstract classes cannot be instantiated and can only be inherited.

2. In a derived class that inherits all of the abstract method overloads to be instantiated.

PHP Object-oriented abstract class