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<?php class foo { private $bar = 5; public function showBar() { return $this->bar; } public function stupid(): callable { $_bar =& $this->bar; return function (int $v) use (&$_bar): void { $this->bar = $v; }; } } $foo = new foo; $bar = $foo->stupid()(36); echo $foo->showBar();
Output for git.master, git.master_jit, rfc.property-hooks
36

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