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Object-Oriented Programming in PHP

Solution Review: Dependency Injection

Let's look at the solution of the Dependency Injection challenge.

We'll cover the following...

Solution: Task 1

PHP
<?php 
class Article { 
    protected $title; 
    protected $author;
    public function __construct($title, $author) {
        $this -> title = $title;
        $this -> author = $author;
    }
    
    public function getTitle() {
        return $this -> title; 
    }
    public function getAuthor() {
        return $this -> author; 
    }
}
class Author { 
    protected $name;
    
    public function setName($name) {
        $this -> name = $name;
    }
    public function getName() {
        return $this -> name; 
    }
}
function test()
{
  $author1 = new Author(); 
  $author1 -> setName("Joe");
  $title = "To PHP and Beyond";
  $article1 = new Article($title,$author1);
  return $article1 -> getTitle() . ' by ' . $article1 -> getAuthor() -> getName();
}
echo test();
?>

Explanation

  • Line 2: We write the Article class with protected properties $title and $author.
  • Line 6: We add the __construct() method to the Article class, which gets two parameters and sets the values of $title and $author properties.
  • Line 11: We add the getTitle() getter method to the Article class, which returns the $title
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