[php]获取当月和上月数据

1.获取上个月第一天及最后一天.

echo date('Y-m-01', strtotime('-1 month'));
echo "<br/>";
echo date('Y-m-t', strtotime('-1 month'));
echo "<br/>";

2.获取当月第一天及最后一天.

$BeginDate=date('Y-m-01', strtotime(date("Y-m-d")));
echo $BeginDate;
echo "<br/>";
echo date('Y-m-d', strtotime("$BeginDate +1 month -1 day"));
echo "<br/>";

3.获取当天年份、月份、日及天数.

echo " 当前年份:".date('Y');
echo " 当前月份:".date('m');
echo " 当前几号:".date('d');
echo " 本月共有:".date("t")."天";
echo "<br/>";

4.使用函数及数组来获取当月第一天及最后一天.

function getthemonth($date){   
    $firstday = date('Y-m-01', strtotime($date));
    $lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));
    return array($firstday,$lastday);
} 
$today = date("Y-m-d");
$day=getthemonth($today);
echo "当月的第一天: ".$day[0]." 当月的最后一天: ".$day[1];
echo "<br/>";