PHP设置30秒内对页面的访问次数

<?php

 
//Calculate 60 days in the future 
//seconds * minutes * hours * days + current time 
$intime = 30 + time(); // 30秒缓存


if(isset($_COOKIE['lastVisit'])) {
$visit = $_COOKIE['lastVisit'] + 1; 
}
else {

$visit = "0";
}
setcookie("lastVisit",$visit, $intime);

echo "Your last visit was - ". $visit; 
?> 
摘自：http://www.oschina.net/code/snippet_943797_19993