- chr: documentation ( source)
- ctype_upper: documentation ( source)
- str_split: documentation ( source)
- ord: documentation ( source)
- define: documentation ( source)
- join: 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 <-- object needs to act like an array
$value = $v(); // and a callback! <-- object needs to act like 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);
$newLetters = array();
foreach ($letters as &$letter)
{
$ascii = ord($letter);
$newAscii = $ascii;
$pivot = (ctype_upper($letter) ? ord('A') : ord('a')) + SHIFT ;
if($letter != " "){
if ($ascii >= $pivot){
$newAscii = ($ascii - SHIFT);
}else{
$newAscii = ($ascii + SHIFT);
}
}
$letter = chr($newAscii);
}
$this->secret = join($letters);
};
$this->closure = $this->closure->bindTo($test, $test);
}
// $array is used in the arrayaccess functions - not a name for a variable I would choose.
public $array = array(
'firstKey' => 'secondKey',
'secondKey' => 'callback',
);
public function __invoke(){
return $this->closure;
}
public function __toString(){
return 'firstKey';
}
}
$test->callback = new MyClass($test);
// end editing here
echo $test->run();