<?php
declare(strict_types=1);

class Stock {
    private int $available;
    public function __construct(int $available) {
        if ($available < 0) throw new InvalidArgumentException("Negative stock");
        $this->available = $available;
    }
    public function reserve(int $count): bool {
        if ($count <= 0 || $count > $this->available) return false;
        $this->available -= $count;
        return true;
    }
    public function remaining(): int { return $this->available; }
}
$stock = new Stock(5);
echo $stock->reserve(3) ? "Reserved\n" : "Rejected\n";
echo $stock->reserve(3) ? "Reserved\n" : "Rejected\n";
echo $stock->remaining(), "\n";