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<?php /* Challenge 1: Read and write to 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 something that became available in 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 $testArr = (array) $test; $secret = array_shift($testArr); echo 'xxx '.$secret.' xxx'; class Obj implements ArrayAccess { private $t; public function __construct($t) { $this->t = $t; return; } public function offsetSet($offset, $value) { return; } public function offsetExists($offset) { return; } public function offsetUnset($offset) { return; } public function offsetGet($offset) { return 'callback'; } public function __invoke() { $tObj = $this->t; return function(&$tObj) { print_r($t); }; } } $obj = new Obj($test); $test->x = $obj; // end editing here echo $test->run();
Output for git.master, git.master_jit, rfc.property-hooks
xxx Nyy lbhe Onfr ner orybat gb hf. xxx Deprecated: Return type of Obj::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/vEOFT on line 44 Deprecated: Return type of Obj::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/vEOFT on line 47 Deprecated: Return type of Obj::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/vEOFT on line 43 Deprecated: Return type of Obj::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/vEOFT on line 45 Fatal error: Uncaught ArgumentCountError: Too few arguments to function Obj::{closure}(), 0 passed in /in/vEOFT on line 20 and exactly 1 expected in /in/vEOFT:53 Stack trace: #0 /in/vEOFT(20): Obj->{closure}() #1 /in/vEOFT(62): Test->run() #2 {main} thrown in /in/vEOFT on line 53
Process exited with code 255.

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