PHP Dependency Injection issue

Question

Ey guys, I am trying to learn Dependency Injection and I wrote this code:

class User {
    public $id;

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

    public function getName() {
        return 'Alex';
    }
}

class Article {
    public $author;

    public function __construct(User $author) {
        $this->author = $author;
    }

    public function getAuthorName() {
        return $this->author->getName();
    }
}

$news = new Article(10);
echo $news->getAuthorName();

However, I am getting WSOD. What had I done wrong in it ?

The constructor of Article requires a user, not an integer; instead, you should do this: $news = new Article(new User(10)); echo $news->getAuthorName(); — Jonan
– Jonan, Commented Feb 15, 2015 at 9:45
What means: WSOD ? Also $news = new Article(10); -> $news = new Article(new User(10)); — Rizier123
– Rizier123, Commented Feb 15, 2015 at 9:45

Utkarsh Dixit · Accepted Answer · 2015-02-15 09:47:00Z

1

You have specified wrong instance.Use the code below

<?php
class User {
    public $id;

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

    public function getName() {
        return 'Alex';
    }
}

class Article {
    public $author;

    public function __construct(User $author) {
        $this->author = $author;
    }

    public function getAuthorName() {
        return $this->author->getName();
    }
}

$news = new Article(new  User(10));
echo $news->getAuthorName(); //Outputs Alex

Hope this helps you

answered Feb 15, 2015 at 9:47

Utkarsh Dixit

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