Creating a new instance of an inherited class through the inherited static methods

Question

I've got a method in my class to create a new 'self' on execution.

class foo {
    private $id;

    public function __construct( $id ) {
        $this->id = $id;
    }

    public static function byId( $id ) {
        return new self( $id );
    }  

}

And now i want to use the byId method from foo and use it in bar, by doing as such

class bar extends foo {
    public function test() {
        echo "test";
    }
}

now I should be able to do bar::byId( id ), however this will always return the parent object and not the bar object.

How can i make sure that byId will return the object of the inherited class if it's called through it?

Lawrence Cherone I am unsure what you mean, i want to be able to call bar->test() by using the static bar::byId( id ) where the byId static method is inherited from foo — pandaJuan, Nov 27 '17 at 10:02
Have you tried using `return new static($id);` isntead of `return new self($id);` ? — Philipp Maurer, Nov 27 '17 at 10:04
Possible duplicate of [New self vs. new static](https://stackoverflow.com/questions/5197300/new-self-vs-new-static) — Philipp Maurer, Nov 27 '17 at 10:05
@PhilippMaurer Thank you, i never knew about new static, as such i did not try looking for this first. — pandaJuan, Nov 27 '17 at 10:06

score 1 · Accepted Answer · answered Nov 27 '17 at 10:07

1

Use return new static($id); instead of return new self($id);

answered Nov 27 '17 at 10:07

Philipp Maurer

2,480
6
18
25

Creating a new instance of an inherited class through the inherited static methods

1 Answers1