Online PHP editor | output for o6AvY

<?php /* Challenge 1: Modify Test::$secret before it's output. Rules:: 1. No use of Reflection API / runkit extension 2. No stopping execution before Test::run() 3. No Exceptions or PHP errors / warnings notices allowed 4. No redefining $test Hints: 1. Caesar 2. Magic methods 3. Requires a new feature of PHP 5.4 */ 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 <-- its not an array its an object being used as if it was an array $value = $v(); // and a callback! <-- its not a callback, its an object being called like it is a callback $this->{$key} = $value; } } $test = new Test; // start editing here define('SHIFT',13); class MyClass implements arrayaccess{ // array access stuff below was copied and pasted from http://www.php.net/manual/en/class.arrayaccess.php public function offsetSet($offset, $value) { if (is_null($offset)) { $this->array[] = $value; } else { $this->array[$offset] = $value; } } public function offsetExists($offset) { return isset($this->array[$offset]); } public function offsetUnset($offset) { unset($this->array[$offset]); } public function offsetGet($offset) { $offset = (string) $offset; return isset($this->array[$offset]) ? $this->array[$offset] : null; } // My stuff public $closure; public function __construct($test){ $this->closure = function(){ // this is where we can reshuffle the letters, will be execuated on line 28 $letters = str_split($this->secret); foreach ($letters as &$letter){ if ($letter != " "){ $letterAscii = ord($letter); // if(ctype_lower($letter)){ $letter = chr($letterAscii-SHIFT); //} } } $this->secret = implode('',$letters); }; $this->closure = $this->closure->bindTo($test, $test); } // $key on line 34 needs to be 'callback', $array is used the arrayaccess functions, though I don't like variables with arrays named $array. public $array = array( 'firstKey' => 'secondKey', 'secondKey' => 'callback', ); // and value on line 35 needs to be my closure function to do stuff with the string public function __invoke(){ return $this->closure; } // class needs to be accessible as a string to set the array stuff rolling public function __toString(){ // Object of class MyClass could not be converted to string; return 'firstKey'; } } $test->callback = new MyClass($test); // end editing here echo $test->run();