myspecialexample.php

<?php

class Link
{
	public function __construct($name, $url)
	{
		$this->name = $name;
		$this->url = $url;
	}
}

// Without DI
class ListOfLinks
{
	public function __construct($database)
	{
		$this->database = $database;
		$this->links = $this->fetch();
	}

	private function fetch()
	{
		$results = $this->database->select('select * from links');
		$links = [];
		foreach ($results as $link) {
			$links[] = new Link($link['name'], $link['url']);
		}
		return $links;
	}
}

// With DI
class ListOfLinks
{
	public function __construct($database, $link_class)
	{
		$this->database = $database;
		$this->link_class = $link_class;
		$this->links = $this->fetch();
	}

	private function fetch()
	{
		$results = $this->database->select('select * from links');
		$links = [];
		foreach ($results as $link) {
			$links[] = new $this->link_class($link['name'], $link['url']);
		}
		return $links;
	}
}