计算两个时间之间相隔几个月

方法如下：

function getMonthNum($date1, $date2, $tags = '-')
{
    $date1 = explode($tags, $date1);
    $date2 = explode($tags, $date2);
    $year  = $date1[0] - $date2[0];
    $month = $date1[1] - $date2[1];

    if ($year > 0) {
        if ($month < 0) {
            return abs($year) * 12 - abs($month);
        }
        return abs($year) * 12 + abs($month);
    } elseif ($year < 0) {
        if ($month > 0) {
            return abs($year) * 12 - abs($month);
        }
        return abs($year) * 12 + abs($month);
    } else {
        if ($month > 0) {
            return $month;
        }
        return abs($month);
    }
}

$_monthCount = getMonthNum('2016-1', '2017-6');

如有问题请留言给我哦，谢谢！