How to prevent page refresh in php?

Method: Determine whether there is a session when accessing the page. If not, create a session directly and set it to the current time. The program will execute normally; if there is a session, determine the time difference between the time in the session and the current time. , if the interval is less than the specified time, program execution is interrupted.

php method to prohibit page refresh

Method 1:

A small piece of code to prevent page refresh may not be of much use, it is just an idea for reference.

Principle:

Determine whether there is a session when the page is accessed. If not, create a session directly and set it to the current time. The program will execute normally;

If there is session, determine the time difference between the time in the session and the current time. If the interval is less than the specified time, such as 5 minutes in this example, the program execution will be interrupted and an error message will be prompted;

If the time in the session is greater than the current time time, refresh the time in the session, and the page will execute normally.

The code is as follows:

session_start();   //启动session
$timeOutLimit = "300";  //设置时间间断五分钟
if (isset($_SESSION["timeout"])) {  //判断是否有session
    if (time() - $_SESSION["timeout"] <</span> $timeOutLimit) {    
    //如果有session 且session时间间隔小于5分钟 直接die()退出并输出提示信息。
       die("请不要多次刷新当前页面");
    } else {    //如果没有超时，将session时间重置为当前时间。
       $_SESSION["timeout"] = time();
    }
} else {
    $_SESSION["timeout"] = time();  
    //如果没有timeout的session，则创建session为当前时间，便于下次访问页面时判断
}
//其它页面代码.....

Method 2:

//代理IP直接退出
empty($_SERVER['HTTP_VIA']) or exit('Access Denied');
//防止快速刷新
session_start();
$seconds = '3'; //时间段[秒]
$refresh = '5'; //刷新次数
//设置监控变量
$cur_time = time();
if(isset($_SESSION['last_time'])){
    $_SESSION['refresh_times'] += 1;
}else{
    $_SESSION['refresh_times'] = 1;
    $_SESSION['last_time']     = $cur_time;
}
//处理监控结果
if($cur_time - $_SESSION[&#39;last_time&#39;] < $seconds){
    if($_SESSION[&#39;refresh_times&#39;] >= $refresh){
        //跳转至攻击者服务器地址
        header(sprintf(&#39;Location:%s&#39;, &#39;http://127.0.0.1&#39;));
        exit(&#39;Access Denied&#39;);
    }
}else{
    $_SESSION[&#39;refresh_times&#39;] = 0;
    $_SESSION[&#39;last_time&#39;] = $cur_time;
}

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