php-简单工厂模式-demo

interface db {

    public function conn();

}





class dbmysql implements db{

    

    public function conn() {

        echo 'mysql is conn';

    }

}





class dbsqlite implements db{

    public function conn() {

        echo 'sqlite is conn';

    }

}



//简单工厂模式

class gongchang{

    public static function createDB($type){

        if($type=='mysql'){

            return new dbmysql();

        }else{

            return new dbsqlite();

        }

    }

}



$db = gongchang::createDB('mysql');

$db->conn();