- str_rot13: documentation ( source)
<?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();