返回两个时间的相距时间

/**
 * 返回两个时间的相距时间，*年*月*日*时*分*秒
 * @param int $one_time 时间戳一
 * @param int $two_time 时间戳二
 * @param int $return_type 默认值为0，0/不为0则拼接返回，1/*秒，2/*分*秒，3/*时*分*秒/，4/*日*时*分*秒，5/*月*日*时*分*秒，6/*年*月*日*时*分*秒
 * @param array $format_array 格式化字符，例，array('年', '月', '日', '时', '分', '秒')
 * @return String or false
 */
function getRemainderTime($one_time, $two_time, $return_type = 0, $format_array = array('年', '月', '日', '时', '分', '秒'))
{
    if ($return_type < 0 || $return_type > 6) {
        return false;
    }
    if (!(is_int($one_time) && is_int($two_time))) {
        return false;
    }
    $remainder_seconds = abs($one_time - $two_time);
    //年
    $years = 0;
    if (($return_type == 0 || $return_type == 6) && $remainder_seconds - 31536000 > 0) {
        $years = floor($remainder_seconds / (31536000));
    }
    //月
    $monthes = 0;
    if (($return_type == 0 || $return_type >= 5) && $remainder_seconds - $years * 31536000 - 2592000 > 0) {
        $monthes = floor(($remainder_seconds - $years * 31536000) / (2592000));
    }
    //日
    $days = 0;
    if (($return_type == 0 || $return_type >= 4) && $remainder_seconds - $years * 31536000 - $monthes * 2592000 - 86400 > 0) {
        $days = floor(($remainder_seconds - $years * 31536000 - $monthes * 2592000) / (86400));
    }
    //时
    $hours = 0;
    if (($return_type == 0 || $return_type >= 3) && $remainder_seconds - $years * 31536000 - $monthes * 2592000 - $days * 86400 - 3600 > 0) {
        $hours = floor(($remainder_seconds - $years * 31536000 - $monthes * 2592000 - $days * 86400) / 3600);
    }
    //分
    $minutes = 0;
    if (($return_type == 0 || $return_type >= 2) && $remainder_seconds - $years * 31536000 - $monthes * 2592000 - $days * 86400 - $hours * 3600 - 60 > 0) {
        $minutes = floor(($remainder_seconds - $years * 31536000 - $monthes * 2592000 - $days * 86400 - $hours * 3600) / 60);
    }
    //秒
    $seconds = $remainder_seconds - $years * 31536000 - $monthes * 2592000 - $days * 86400 - $hours * 3600 - $minutes * 60;
    $return = false;
    switch ($return_type) {
        case 0:
            if ($years > 0) {
                $return = $years . $format_array[0] . $monthes . $format_array[1] . $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            } else if ($monthes > 0) {
                $return = $monthes . $format_array[1] . $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            } else if ($days > 0) {
                $return = $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            } else if ($hours > 0) {
                $return = $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            } else if ($minutes > 0) {
                $return = $minutes . $format_array[4] . $seconds . $format_array[5];
            } else {
                $return = $seconds . $format_array[5];
            }
            break;
        case 1:
            $return = $seconds . $format_array[5];
            break;
        case 2:
            $return = $minutes . $format_array[4] . $seconds . $format_array[5];
            break;
        case 3:
            $return = $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            break;
        case 4:
            $return = $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            break;
        case 5:
            $return = $monthes . $format_array[1] . $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            break;
        case 6:
            $return = $years . $format_array[0] . $monthes . $format_array[1] . $days . $format_array[2] . $hours . $format_array[3] . $minutes . $format_array[4] . $seconds . $format_array[5];
            break;
        default:
            $return = false;
    }
    return $return;
}