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<?php /* Challenge 2: Implement AnswerInterface and get Question to echo "4". */ class Question { public function __construct(AnswerInterface $answer) { echo "What is 2 + 2?\n"; $answer = $answer->get()->the()->answer(); if ($answer instanceof AnswerInterface) { echo $answer . PHP_EOL; } } } interface AnswerInterface { public function get(); public function the(); public function answer(); } // start editing here class Answer implements AnswerInterface { function get(){ echo '4'; } function the(){ } function answer(){ } } // end editing here $answer = new Answer; $question = new Question($answer);
Output for git.master, git.master_jit, rfc.property-hooks
What is 2 + 2? 4 Fatal error: Uncaught Error: Call to a member function the() on null in /in/jjC2t:11 Stack trace: #0 /in/jjC2t(45): Question->__construct(Object(Answer)) #1 {main} thrown in /in/jjC2t on line 11
Process exited with code 255.

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