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<?php class Foo { private $bar; } $foo = new Foo(); $friend = Closure::bind(function & (Foo $foo) use (& $friend) { return $foo->bar; }, null, 'Foo')->__invoke($foo); var_dump($foo); $friend = 'baz'; var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
object(Foo)#1 (1) { ["bar":"Foo":private]=> NULL } object(Foo)#1 (1) { ["bar":"Foo":private]=> NULL }

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