Getting the name of a child class in the parent class (static context)

Question

I\'m building an ORM library with reuse and simplicity in mind; everything goes fine except that I got stuck by a stupid inheritance limitation. Please consider the code bel

Answer 1

It appears you might be trying to use a singleton pattern as a factory pattern. I would recommend evaluating your design decisions. If a singleton really is appropriate, I would also recommend only using static methods where inheritance is not desired.

class BaseModel
{

    public function get () {
        echo get_class($this);

    }

    public static function instance () {
        static $Instance;
        if ($Instance === null) {
            $Instance = new self;

        }
        return $Instance;
    }
}

class User
extends BaseModel
{
    public static function instance () {
        static $Instance;
        if ($Instance === null) {
            $Instance = new self;

        }
        return $Instance;
    }
}

class SpecialUser
extends User
{
    public static function instance () {
        static $Instance;
        if ($Instance === null) {
            $Instance = new self;

        }
        return $Instance;
    }
}


BaseModel::instance()->get();   // value: BaseModel
User::instance()->get();        // value: User
SpecialUser::instance()->get(); // value: SpecialUser