<?php

class Calc
{

    private $nums;

    public function __construct(array $nums)
    {
        if (!is_array($nums)) {
            thown new \Exception("Method wait array");
        }

        $this->nums = $nums;
    }

    public function getResult()
    {
        $result = 0;
        foreach ($this->nums as $num) {
            $result += $num;
        }

        return $result;
    }

}