Articles 2

<?php

Class Article
{
    /**
     * @var string
     */
    private $title;
    /**
     * @var string
     */
    private $content;
    /**
     * @var string
     */
    private $author;

    /**
     * Article constructor.
     * @param string $title
     * @param string $content
     * @param string $author
     */
    public function __construct(string $title, string $content, string $author)
    {
        $this->title = $title;
        $this->content = $content;
        $this->author = $author;
    }

    /**
     * @return string
     */
    public function getTitle(): string
    {
        return $this->title;
    }

    /**
     * @param string $title
     */
    public function setTitle(string $title): void
    {
        $this->title = $title;
    }

    /**
     * @return string
     */
    public function getContent(): string
    {
        return $this->content;
    }

    /**
     * @param string $content
     */
    public function setContent(string $content): void
    {
        $this->content = $content;
    }

    /**
     * @return string
     */
    public function getAuthor(): string
    {
        return $this->author;
    }

    /**
     * @param string $author
     */
    public function setAuthor(string $author): void
    {
        $this->author = $author;
    }

    public function __toString()
    {
        return $this->getTitle() . ' - ' . $this->getContent() . ': ' . $this->getAuthor() . PHP_EOL;
    }


}

$articles = [];

$n = intval(readline());

for ($i = 0; $i < $n; $i++) {
    $cmd = explode(', ', readline());
    list($title, $content, $author) = $cmd;
    $article = new Article($title, $content, $author);
    $articles[] = $article;
}

$orderBy = readline();

uasort($articles, function (Article $article1, Article $article2) use ($articles, $orderBy) {
   if ($orderBy === 'title'){
       return $article1->getTitle() <=> $article2->getTitle();
   } elseif ($orderBy === 'content') {
       return $article1->getContent() <=> $article2->getContent();
   }elseif ($orderBy === 'author') {
       return $article1->getAuthor() <=> $article2->getAuthor();
   }
});

foreach ($articles as $articleInOrder) {
    echo $articleInOrder;
}