如何获取2014-11-12三天前的日期

<br><!--?php<br /-->$time='2014-11-12';<br>echo date('Y-m-d',strtotime("$time-3 days"));<br>?><br>

<br>$conn=mysqli_connect('localhost','root','root');<br>$res=mysqli_query($conn,"SELECT ADDDATE('2014-11-12',INTERVAL -3 DAY)");<br>$row=mysqli_fetch_array($res);<br>echo $row[0];<br>

<br>2014-11-09<br>