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@ 2014-04-17T12:21:18Z

<?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();
}

class Answer implements AnswerInterface
{
    private $output;

    public function __construct($output = 4)
    {
        $this->output = $output;
    }

    public function getAnswer()
    {
        return $this->output;
    }

    public function get()
    {
        return $this;
    }

    public function the()
    {
        return $this;
    }

    public function answer()
    {
        return $this->getOutput();
    }
}

// start editing here


// end editing here

$answer = new Answer;
$question = new Question($answer);

Output for git.master, git.master_jit, rfc.property-hooks: What is 2 + 2? Fatal error: Uncaught Error: Call to undefined method Answer::getOutput() in /in/UgE3c:53 Stack trace: #0 /in/UgE3c(12): Answer->answer() #1 /in/UgE3c(63): Question->__construct(Object(Answer)) #2 {main} thrown in /in/UgE3c on line 53
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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