No Binding But With Original

<?php

class A {
    public function method() {    }
}

class B extends A  {
    public function method() {    }
}

class C {
    public function method() {    }
}

class D { }

$fn = Closure::fromCallable([new A, 'method']);
$fn->call(new B); // error
$fn->call(new C); // error
$fn->call(new D); // error

?>

It is possible to change the underlying object of a closure. The new closure will be executed with the new object, with the same method.

On the other hand, it is not possible to call that closure on another class, even if that class has the same method, nor even if the class is a child of the original one. It must be the same original class.

See Also

• The Closure class (PHP manual)
• Rebind to object [Try me]

PHP Error Messages

• Cannot rebind scope of closure created from method

PHP Features

• closure
• bind

Last updated: 10 September 2026