PHP获取指定日期的月份月初日期和月末日期

PHP获取指定日期的月份月初日期和月末日期

//    获取指定日期的月初与月末日期
    protected function GetTheMonth($date){
        $firstday = date("Y-m-01",strtotime($date)); //月初
        $lastday = date("Y-m-d",strtotime("$firstday +1 month -1 day"));  //月末
        $last_month_firstday = date("Y-m-01",strtotime("$date -1 month ")); //上月初
        $last_month_lastday = date("Y-m-d",strtotime("$last_month_firstday +1 month -1 day")); //上月末
        return array('firstday'=>$firstday,'lastday'=>$lastday,'last_month_firstday'=>$last_month_firstday,'last_month_lastday'=>$last_month_lastday);
    }