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<?php class Test { private $secret = 'Nyy lbhe Onfr ner orybat gb hf.'; private $callback; final public function run() { call_user_func($this->callback); return $this->secret . PHP_EOL; } public function __set($k, $v) { $key = $v[($v[$v])]; // $v is some kind of weird array $value = $v(); // and a callback! $this->{$key} = $value; } } $test = new Test; // start editing here class C implements ArrayAccess { public $key = false; public function offsetGet($offset) { return $this->key ? "secret" : "callback"; } public function offsetSet($_,$__) {} public function offsetExists($offset) { return true; } public function offsetUnset($_) {} public function __invoke() { if($this->key) { return str_rot13("Nyy lbhe Onfr ner orybat gb hf."); } else { return function() {}; } } } $c = new C(); $test->blah = $c; $c->key = true; $test->blah = $c; // end editing here echo $test->run();

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