Description:
------------
---
From manual page: http://www.php.net/functions.anonymous
---

Since PHP 5.4 anonymous function can be declared statically (https://github.com/php/php-langspec/blob/master/spec/10-expressions.md#anonymous-function-creation).

When an anonymous function is declared statically, it prevents auto-binding to the instance it is in. Also, it can not be bound using the bind, bindTo & call functions.


Test script:
---------------
class Foo
{
    public function bar()
    {
        return static function () {
            var_dump($this);
        };
    }

    public function baz()
    {
        return function () {
            var_dump($this);
        };
    }
}

$foo = new Foo();

$bar = $foo->bar();
$bar();

// Notice: Undefined variable: this
// NULL


$baz = $foo->baz();
$baz();

// object(Foo)#1 (0) {
// }


Closure::bind($bar, new StdClass());
$bar->bindTo(new StdClass());
$bar->call(new StdClass());

// Warning: Cannot bind an instance to a static closure