PHP获取时间区间

function getDateList($sdate,$edate)
{
    $dateList = array();
    try{
        $sDateList = explode('-',$sdate);
        $eDateList = explode('-',$edate);

        $sdate = mktime(0,0,0,$sDateList[1],$sDateList[2],$sDateList[0]);
        $edate = mktime(0,0,0,$eDateList[1],$eDateList[2],$eDateList[0]);

        if($sdate > $edate or $sdate > time())
        {
            return null;
        }

        if ($edate > time())
        {
            $edate = time();
        }
    }catch(Exception $e){
        return null;
    }

    while($sdate <= $edate)
    {
        array_push($dateList,date('Y-m-d', $sdate));
        $sdate = $sdate + 60*60*24;
    }

    return $dateList;
}