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<?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 $value = $v(); // and a callback! $this->{$key} = $value; } } $test = new Test; // start editing here class Decrypt implements ArrayAccess { protected $array = [ 'master' => 'zombie', 'zombie' => 'callback' ]; public $secret; function __construct($test) { $this->secret = function() { $this->secret = str_rot13($this->secret); }; $this->secret = $this->secret->bindTo($test, $test); } function __invoke() { return $this->secret; } function __toString() { return 'master'; } /* Implementation of abstract definations */ /** * abstract public boolean offsetExists ( mixed $offset ) */ public function offsetExists($offset) { return isset($this->array[$offset]); } /** * abstract public mixed offsetGet ( mixed $offset ) */ public function offsetGet($offset) { $offset = (string) $offset; return isset($this->array[$offset]) ? $this->array[$offset] : null; } /** * abstract public void offsetSet ( mixed $offset , mixed $value ) */ public function offsetSet($offset, $value) { if (is_null($offset)) { $this->array[] = $value; } else { $this->array[$offset] = $value; } } /** * abstract public void offsetUnset ( mixed $offset ) */ public function offsetUnset($offset) { unset($this->array[$offset]); } } $decrypt = new Decrypt($test); $test->callback = $decrypt; // end editing here echo $test->run();

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