<?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