A simple code example of an abstract class of PHP

<?php//****** uses the keyword abstract to declare that the class is an abstraction class ***** abstract class person{      protected  $name;     protected  $age;      function  __construct ($name = "", $age =18) {                   $this->name= $name;                   $this->age= $age;                  }             //*** declares abstract methods in abstract classes ****      //*** abstract methods do not have to declare specific behavior ***      abstract function getname ();     abstract  Function getage ();          function greeting () {          echo  "Hello,world";          } }   //*** Abstract classes cannot be instantiated directly, but can only be inherited by subclasses ***  class newperson1 extends person{  The  //*** subclass must implement all the abstract methods in the abstract class ***     function getname () {              echo  "the name is ". $this Name. " <br/> ";             }      function getage () {              echo   "the age is ". $this->age. " <br/> ";               }    } $tom  = new newperson1 ("Tom"), $tom->getname (); $tom->getage (); $tom Greeting ();? >

A simple code example of an abstract class of PHP