//获取指定日期所在星期的开始时间与结束时间
function getWeekRange($date){
    $ret=array();
    $timestamp=strtotime($date);
    $w=strftime('%u',$timestamp);
    $ret['sdate']=date('Y-m-d 00:00:00',$timestamp-($w-1)*86400);
    $ret['edate']=date('Y-m-d 23:59:59',$timestamp+(7-$w)*86400);
    return $ret;
}

//author:zhxia 获取指定日期所在月的开始日期与结束日期
function getMonthRange($date){
    $ret=array();
    $timestamp=strtotime($date);
    $mdays=date('t',$timestamp);
    $ret['sdate']=date('Y-m-1 00:00:00',$timestamp);
    $ret['edate']=date('Y-m-'.$mdays.' 23:59:59',$timestamp);
    return $ret;
}


//author:zhxia  以上两个函数的应用
function getFilter($n){
    $ret=array();
    switch($n){
        case 1:// 昨天
            $ret['sdate']=date('Y-m-d 00:00:00',strtotime('-1 day'));
            $ret['edate']=date('Y-m-d 23:59:59',strtotime('-1 day'));
        break;
        case 2://本星期
            $ret=getWeekRange(date('Y-m-d'));
        break;
        case 3://上一个星期
            $strDate=date('Y-m-d',strtotime('-1 week'));
            $ret=getWeekRange($strDate);
        break;
        case 4: //上上星期
            $strDate=date('Y-m-d',strtotime('-2 week'));
            $ret=getWeekRange($strDate);
        break;
        case 5: //本月
            $ret=getMonthRange(date('Y-m-d'));
            break;
        case 6://上月
            $strDate=date('Y-m-d',strtotime('-1 month'));
            $ret=getMonthRange($strDate);
        break;
    }
    return $ret;
}