php 时间统计处理

/**
     * @param $month
     * @return string
     * 指定年月份获取月初月末的时间戳
     */
    public function getTime($month)
    {
        $month_start = strtotime($month);//指定年月份月初时间戳
        $BeginDate = date('Y-m-01', strtotime($month));
        $EndDate = date('Y-m-d', strtotime("$BeginDate +1 month -1 day"));
        $month_end = strtotime("next day", strtotime($EndDate)) - 1;//指定年月份月末时间戳
        $months = $month_start . ' and ' . $month_end;
        return $months;
    }

获取从2017-01到现在所有的月份

$start_time = "2017-01";
        $strtotime_start_time = strtotime($start_time);
        $lastMonth = strtotime(date("Y-m", time()));
        $monthArr = [];
        for ($i = 1; $lastMonth > $strtotime_start_time; $i++) {
            $lastMonths =  strtotime(date('Y-m') . '-01 00:00:01');
            $t = "-". $i ." month";
            $lastMonths = date('Y-m', strtotime($t, $lastMonths));
            var_dump(strtotime($lastMonths));
            array_push($monthArr, $lastMonths);
            $lastMonth = strtotime($lastMonths);
        }