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run code in 150+ php & hhvm versions
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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 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])]; // $v is some kind of weird array die('here'.$key ); $this->testy = $key; $value = $v(); // and a callback! $this->{$key} = $value; } } $test = new Test; // start editing here class Intercept { public function getKey($test) { $array = (array) $test; reset($array); $first_key = key($array); print_r($array[$first_key]); //$v = array(); //$v[$first_key] = 'blah'; //$blah = $v[$first_key]; $blah= array(); $blah[0] = 'dobee'; //$test->__set($array[$first_key] , $blah ); /* foreach($array as $k => $v) { print_r($k); print_r($v); } */ } } $intercept = new Intercept; $intercept->getKey($test); // end editing here //echo $test->run(); $test->run();
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Nyy lbhe Onfr ner orybat gb hf. Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /in/L1FTh on line 29
Output for hhvm-3.12.0
Nyy lbhe Onfr ner orybat gb hf. Warning: Invalid argument: function: not string, closure, or array in /in/L1FTh on line 29
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.2 - 5.2.17
Nyy lbhe Onfr ner orybat gb hf. Warning: call_user_func(): First argument is expected to be a valid callback in /in/L1FTh on line 29
Output for 5.0.0 - 5.0.1
Nyy lbhe Onfr ner orybat gb hf. Warning: call_user_func(): First argument is expected to be a valid callback in /in/L1FTh on line 29 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/L1FTh on line 31
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/L1FTh 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/L1FTh 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/L1FTh on line 22
Process exited with code 255.