PHP new static($variable)

Question

 $model = new static($variable);

All these are within a method inside a class, I am trying to technically understand what this piece of code does. I ran around in the Google world. But can't find anything that leads me to an answer. Is this just another way of saying.

 $model = new static $variable;

Also what about this

 $model = new static;

Does this mean I'm initializing a variable and settings it's value to null but I am just persisting the variable not to lose the value after running the method?

Answer 1

static in this case means the current object scope. It is used in late static binding.

Normally this is going to be the same as using self. The place it differs is when you have a object heirarchy where the reference to the scope is defined on a parent but is being called on the child. self in that case would reference the parents scope whereas static would reference the child's

class A{
    function selfFactory(){
        return new self();
    }

    function staticFactory(){
        return new static();
    }
}

class B extends A{
}


$b = new B();

$a1 = $b->selfFactory(); // a1 is an instance of A

$a2 = $b->staticFactory(); // a2 is an instance of B

It's easiest to think about self as being the defining scope and static being the current object scope.