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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 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 A implements ArrayAccess { private $callCount = 0; public $func; public function __construct(){ $this->func = function(){ echo "A".$this->secret."B";die; }; } public function __invoke(){ return $this->func; } public function offsetSet($offset, $value) {} public function offsetExists($offset) { return true; } public function offsetUnset($offset) {} public function offsetGet($offset) { $this->callCount++; if ($this->callCount == 1){ $r = $this; } else { $r = "callback"; } return $r; } } $a = new A; $a->func = $a->func->bindTo($test, "Test"); $test->foo = $a; // end editing here echo $test->run();
Output for 5.4.0 - 7.1.0
ANyy lbhe Onfr ner orybat gb hf.B
Output for 5.3.0 - 5.3.29
Fatal error: Call to undefined method Closure::bindTo() in /in/DebN0 on line 84
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/DebN0 on line 52
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/DebN0 on line 52
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/DebN0 on line 21
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/DebN0 on line 21
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/DebN0 on line 21
Process exited with code 255.