<?php 

session_start();

$k=$_GET['k'];

$t=$_GET['t'];

$allowTime = 5 ;//防刷新时间

$ip = $_SERVER["REMOTE_ADDR"];


$allowT = md5($ip.$k.$t);

if(!isset($_SESSION[$allowT]))

{
$refresh = true;

$_SESSION[$allowT] = time();

}elseif(time() - $_SESSION[$allowT]>$allowTime){
$refresh = true;

$_SESSION[$allowT] = time();

}else{
    echo '<script>alert("您好，请5秒钟后再次刷新，感谢您的理解与支持")</script>';
$refresh = false;

} 


?>