what means new static? [duplicate]

Question

I saw in some frameworks this line of code:

return new static($view, $data); 

how do you understand the new static?

Answer 1

When you write new self() inside a class's member function, you get an instance of that class. That's the magic of the self keyword.

So:

class Foo {    public static function baz() {       return new self();    } }  $x = Foo::baz();  // $x is now a `Foo` 

You get a Foo even if the static qualifier you used was for a derived class:

class Bar extends Foo { }  $z = Bar::baz();  // $z is now a `Foo` 

If you want to enable polymorphism (in a sense), and have PHP take notice of the qualifier you used, you can swap the self keyword for the static keyword:

class Foo {    public static function baz() {       return new static();    } }  class Bar extends Foo { }  $wow = Bar::baz();  // $wow is now a `Bar`, even though `baz()` is in base `Foo` 

This is made possible by the PHP feature known as late static binding; don't confuse it for other, more conventional uses of the keyword static.