PHP如何计算两个时间之间相差多少时分秒

关于PHP如何计算两个时间之前的差值，见代码：

/**
 * 计算时间差
 * @param int $timestamp1 时间戳开始
 * @param int $timestamp2 时间戳结束
 * @return array
 */
function time_diff($timestamp1, $timestamp2)
{
    if ($timestamp2 <= $timestamp1)
    {
        return ['hours'=>0, 'minutes'=>0, 'seconds'=>0];
    }
    $timediff = $timestamp2 - $timestamp1;
    // 时
    $remain = $timediff%86400;
    $hours = intval($remain/3600);

    // 分
    $remain = $timediff%3600;
    $mins = intval($remain/60);
    // 秒
    $secs = $remain%60;

    $time = ['hours'=>$hours, 'minutes'=>$mins, 'seconds'=>$secs];

    return $time;
}

测试用例：

$time1 = 1478483626;

$time2 = 1478485126;

var_dump(time_diff($time1, $time2));

输出结果：

　　array(3) { ["hours"]=> int(0) ["minutes"]=> int(25) ["seconds"]=> int(0) }

什么天之类的类似方法，注意时分秒之间的倍数是60就好计算了。