php获得时间段的月

1.时间：
$start_time = $_GET['start_time']; //2015-01
$end_time = $_GET['end_time'];   //2015-05
2.对时间进行拆分：
$time['start_time'] = explode('-', $start_time);
$time['end_time'] = explode('-', $end_time);

$j = $time['end_time'][0] - $time['start_time'][0];  //得到开始月
$year1 = $time['start_time'][0];
$time1 = array();
$k = 1;
for ($i = $time['start_time'][1]; $i <= $time['end_time'][1] + $j * 12; $i++) {
    if (!($i % 12)) $moth1 = 12;
    else $moth1 = $i % 12;
    $data = date('Y-m', strtotime($year1 . "-" . $moth1));
    $non = $year1 . $moth1;
    $time1[$k++] = $non;
    if (!($i % 12)) $year1++;
}
得到结果 ：2015-01  2015-02  2015-03  2015-04 2015-05