Get the closest number in array (PHP)

closestNumberInArr.php

<?

     /**
     * @param mixed $search
     * @param array $arr
     * @return mixed|null
     */
    public function getClosestNumber($search, array $arr)
    {
        $closest = null;
        foreach ($arr as $item) {
            if ($closest === null || abs($search - $closest) > abs($item - $search)) {
                $closest = $item;
            }
        }

        return $closest;
    }