为什么这个抽象类在Php中输出什么？
问题描述：
Why does this abstract class not work and output nothing?
<?php
abstract class Con {
function __construct($name);
}
}
class Shop extends Con {
function __construct($name) {
$this->shopname = $name;
}
function write() {
echo $this->shopname;
}
function outputdate() {
echo ' ' . date('Y');
}
function __destruct() {
$this->outputdate();
}
}
为什么这个抽象类不起作用而且什么都不输出？ p>
＆lt;？php
abstract class Con {
function __construct（$ name）;
}
}
class Shop extends Con {
function __construct（$ name）{
$ this-＆gt; shopname = $ name;
}
函数write（）{
echo $ this-＆gt; shopname;
}
函数outputdate（）{
echo''。 日期（'Y'）;
}
函数__destruct（）{
$ this-＆gt; outputdate（）;
}
}
code> pre>
div>
答
You cannot define some class in other class body. Instead, you must use PHP OOP features to extend one class from another.
class Shop extends Con{
...code goes here....
}
$shop = new Shop('shopname');
$shop->write();
答
You can't instantiate an abstract class. Also, you can't create a class within another class.
http://php.net/manual/en/language.oop5.abstract.php
http://en.wikipedia.org/wiki/Abstract_type
Check out this link if you are looking to subclass.