PHP7

Player.php

<?php

namespace App\MusicPlayer;

/**
 * A music player!
 */
class Player {

    /**
     * Some id
     *
     * @var int
     */
    public $id;

    /**
     * Repeat the song x times
     */
    function repeat(int $times): bool 
    {
    }

    /**
     * Adds a new song to the playlist
     *
     * @throws DrmException
     * @return void
     */
    function addSong(Song $song)
    {
    }

    /**
     * Returns all songs
     */
    function getSongs(): array
    {

        return [];

    }

    /**
     * Returns a singleton instance
     */
    static function getInstance(): self 
    {
    }

    /**
     * Secret key
     *
     * @var string
     */
    private $key;

    /**
     * Secret stuff!
     */
    private function secret() 
    {
    }

}