1.根据当前时间计算N天后的时间$info=(newDateTime($nowDate))->add(newDateInterval("P{$days}D"))->format('Y-m-d’);2.根据一个指定的时间获取改天是周几$weekarray=array("日","一","二","三","四","五","六");echo"星期".$weekarray[date("w","2015-11-26")];3.二维数组排序$data=array();$data[]=array('volume'=>67,'edition'=>2);$data[]=array('volume'=>86,'edition'=>1);$data[]=array('volume'=>85,'edition'=>6);$data[]=array('volume'=>98,'edition'=>2);$data[]=array('volume'=>86,'edition'=>6);$data[]=array('volume'=>67,'edition'=>7);//取得列的列表foreach($dataas$key=>$row){$volume[$key]=$row['volume'];$edition[$key]=$row['edition'];}array_multisort($volume,SORT_DESC,$edition,SORT_ASC,$data);4.数组去重去空$newData=array_unique(array_filter($oldData));