PHP advanced object construction and use of factory pattern_PHP tutorial

/*
* Practice the use of PHP design pattern factory pattern every day
* The PHP factory pattern is not difficult to understand. As the name suggests, it is a processing factory, and the factory manufactures products. As long as the product is manufactured
* There must be several elements: "method", "model", "factory floor".
*/
/*First example ordinary factory pattern
* */
abstract class model {//Product model
abstract function getNames();
}
class zhangsan extends model {//Product instance
function getNames(){
return "my name is zhengsan";
}
}
class lisi extends model{//Product instance
function getNames(){
return "my name is lisi";
}
}
abstract class gongchangModel {//Factory model
abstract function getZhangsan();
abstract function getLisi();
}
class gongchang extends gongchangModel{//Factory instance
function getZhangsan(){
return new zhangsan();
}
function getLisi(){
return new lisi();
}
}
$gongchang=new gongchang();//Instancing factory
$zhangsan=$gongchang->getZhangsan();//Manufacturing Product
echo $zhangsan->getNames();//Product output function
?>

abstract class prModel {//Product model
abstract function link();
}
class webLink extends prModel{//Example a product
public function link(){
echo "www.jb51.net";
}
}
class gongchang {//Factory
static public function createLink (){
return new webLink();
}
}
$weblink=gongchang::createLink();//Create an object through the factory
$weblink ->link();//Output www.jb51.net
?>