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<?php class Foo { private $bar = 'baz'; } echo (new Foo)->bar; $reader = function & ($object, $property) { $value = & Closure::bind(function & () use ($property) { return $this->$property; }, $object, $object)->__invoke(); return $value; }; $foo = new Foo(); $bar = & $reader($foo, 'bar'); $bar = 'tab'; var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot access private property Foo::$bar in /in/6GVob:8 Stack trace: #0 {main} thrown in /in/6GVob on line 8
Process exited with code 255.

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