Showing how to use Value Objects to get better code maintenance and better design.

sample.php

<?php
declare(strict_types = 1);

namespace App
{
    class Status
    {
        const ACTIVE   = 1;
        const INACTIVE = 2;
        const SOLD     = 3;

        private $value;

        private $labels = [
            self::ACTIVE   => 'Active',
            self::INACTIVE => 'Inactive',
            self::SOLD     => 'Sold',
        ];

        /**
         * Status constructor.
         * @param $value
         */
        public function __construct(int $value)
        {
            if (!in_array($value, array_keys($this->labels))) {
                throw new \InvalidArgumentException('Invalid status');
            }

            $this->value = $value;
        }

        public function __toString()
        {
            return $this->labels[$this->value];
        }
    }

    class Product
    {
        private $id;
        private $name;
        private $status;

        /**
         * Product constructor.
         * @param $id
         * @param $name
         * @param $status
         */
        public function __construct(int $id, string $name, Status $status)
        {
            $this->id = $id;
            $this->name = $name;
            $this->status = $status;
        }
    }

    $status = new Status(Status::SOLD);
    var_dump(new Product(1, 'Chess board', $status));
    echo "\n\n\n\n{$status}";
}