继承和多态
继承和多态<?php
class Book{
const NAME='computer';
function __construct(){
echo '本月图书类冠军为:'.Book::NAME.' ';
}
}
class book_1 extends Book{
const NAME = 'foreign language';
function __construct(){
parent::__construct();
echo '本月图书类冠军为:'.self::NAME.' ';
}
}
$obj = new book_1();
?>
执行结果:
本月图书类冠军为:computer 本月图书类冠军为:foreign language
页:
[1]