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<?php class Foo { private $bar; } $friend = null; Closure::bind(function (Foo $foo) use (& $friend) { $friend = & $foo->bar; }, null, 'Foo')->__invoke($foo); $foo = new Foo(); var_dump($foo); $friend = 'baz'; var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $foo in /in/CL5Hv on line 10 Fatal error: Uncaught TypeError: Foo::{closure}(): Argument #1 ($foo) must be of type Foo, null given in /in/CL5Hv:8 Stack trace: #0 /in/CL5Hv(10): Foo::{closure}(NULL) #1 /in/CL5Hv(10): Closure->__invoke(NULL) #2 {main} thrown in /in/CL5Hv on line 8
Process exited with code 255.

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