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run code in 150+ php & hhvm versions
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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 <-- 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();
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
All your Base are belong to us;
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Fatal error: Call to undefined method Closure::bindTo() in /in/CRJal on line 100
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/CRJal on line 75
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/CRJal on line 75
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CRJal on line 22
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CRJal on line 22
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/CRJal on line 22
Process exited with code 255.