php各种日期时间代码介绍

php如何获取各种日期时间？下面编程教程网小编给大家详细介绍一下代码！

获取当天年份、月份、日及天数

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

获取本周的第一天和最后一天

$sdefaultDate = date("Y-m-d");
$first = 1;
$w = date('w', strtotime($sdefaultDate));
$week_start = date('Y-m-d', strtotime("$sdefaultDate -".($w ? $w - $first : 6).' days'));
$week_end = date('Y-m-d',strtotime("$week_start +6 days"));

获取当月第一天和最后一天

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

获取上个月第一天和最后一天

echo date('Y-m-01', strtotime('-1 month'));
echo date('Y-m-t', strtotime('-1 month'));

判断今天是星期几

$weekarray=array("日","一","二","三","四","五","六");
echo "星期".$weekarray[date("w")];