PHP Abstract Class Usage example Analysis _php skill

This example describes the use of PHP abstract classes. Share to everyone for your reference. Specifically as follows:

<?php
/
 * Abstract
 class:
 * 1, there is at least one abstract method (no concrete implementation method)
 * 2, cannot be instantiated, can be inherited
 * 3, abstract class can have child abstract class
 * Relative to the interface:
 * 1, can have attributes
 * 2, a subclass can only inherit an abstract class, but can implement multiple interfaces * * * * * *
 abstract class Qian {
  Abstract function GetFirst ();
  function Gettwo () {
    echo ' I am gettwo ';
  }
 }
 Abstract class JJ extends Qian {
  abstract function getthree ();
 }
 Class Nan extends JJ {
  function GetFirst () {
    echo "I am GetFirst";
  }
  function Getthree () {
    echo ' I am Getthree ';
  }
 }
 $nn = new Nan ();
 $nn->getfirst ();
 $nn->gettwo ();
 $nn->getthree ();
? >

I hope this article will help you with your PHP program design.