Abstract class and abstract method concepts and usage analysis in PHP, PHP abstract _php Tutorial

Abstract class and abstract method concepts and usage analysis in PHP, PHP abstraction

The examples in this article describe abstract classes and abstract methods in PHP. Share to everyone for your reference, as follows:

Abstract Key Words: Abstraction

Abstract is not an exact description, but there is a certain concept or name, in PHP to declare an abstract class or method we need to use the Adstract keyword.

II. definitions of abstract methods and abstract classes

At least one of the methods in a class is abstract, which we call abstract classes. So if you define an abstract class, you first define an abstract method.

Abstract class class1{  abstract function fun1 ();

1. There is at least one abstract method in the class
2. The abstract method does not allow {}
3. abstract methods must be added before

III. rules for the use of abstract classes and methods

Several features of abstract classes:

1, can not be instantiated, can only be inherited
2. inherit all abstract method overloads in the derived class to instantiate

Instance:

<?phpabstract class cl1{  abstract function fun1 ();  Abstract function fun2 ();} Class Cl2 extends cl1{  function fun1 () {    echo "first";  }  function fun2 () {    echo "second";  }} $c =new Cl2 (); Echo $c->fun2 ();? >

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I hope this article is helpful to you in PHP programming.

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