PHP获取某月有多少天某天是星期几等等

<?php
$t=mktime(0,0,0,'11','22','2015');
echo date('t',$t)."<br>"; //某月有多少天
echo date('N',$t)."<br>"; //某天是星期几

$now = strtotime(date("Y-m-d"));
$day = date('Y-m-d',strtotime("+30 days",$now));
echo "30天后：".$day."<br>";
$week = date('Y-m-d',strtotime("-1 week",$now));
echo "1周前：".$week."<br>";
$mon = date('Y-m-d',strtotime("11 month",$now));
echo "11个月后：".$mon."<br>";
?>

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