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();