项目开发中，获取2个时间点之间的年月是很常见的，特别在统计图表中。

$start_time = strtotime(date("Ymd 00:00:00",1519970368));
$end_time = time();

for($start_time; $start_time <= $end_time;  $start_time = strtotime('+1 month', $start_time)){
    $month_arr[] = date('Y-m',$start_time); // 取得递增月; 
}

$month_arr 就是获取到的年月的数组。

Array
(
    [0] => 2018-03
    [1] => 2018-04
    [2] => 2018-05
    [3] => 2018-06
    [4] => 2018-07
    [5] => 2018-08
    [6] => 2018-09
    [7] => 2018-10
    [8] => 2018-11
    [9] => 2018-12
    [10] => 2019-01
    [11] => 2019-02
    [12] => 2019-03
    [13] => 2019-04
    [14] => 2019-05
    [15] => 2019-06
    [16] => 2019-07