https://www.yiichina.com/extension/2073

https://www.yiichina.com/extension/2073

https://www.yiichina.com/extension/2073

https://www.yiichina.com/extension/2073

https://www.yiichina.com/extension/2073

抱歉，之前一直比较忙，做了个在线的演示 https://www.yiichina.com/extension/2073

function getPeriod($date="now", $num=12)
 {
     $time = strtotime($date);
     $return = [];
     for($i=0;$i<$num;$i++) {
         $return[] = date("Y-m", strtotime("-${i} month", $time));
     }
     return $return;
}

近期我做一个在线演示吧。