如何在php中增加会话值 - How to increment a session value in php

我正在开发一个登录系统。我有我的登录表单的帖子检查。php。

如果用户详细信息不正确，我正在尝试编写一个函数来测试失败登录尝试的次数。

<?php
//from check.php
if (blah)
{
    $_SESSION['error'] = "<strong>Details not correct.</strong> Please try again.";     
    //$_SESSION['email'] = $email;
    $_SESSION['attempts'] = 1; //first attempt
    if(isset($_SESSION['attempts']))
    {
        $_SESSION['fail'] = $_SESSION['attempts']++; //increment
    }
    //$_SESSION['fail'] is echo'd on my login form 
}

这段代码除了逻辑

没有任何错误。

如果下面的代码在任何函数中。显然，它会在增加到2后停止。因此，$_SESSION['attempts']在每次函数调用中都被设置为1。你必须在函数调用之前设置$_SESSION['attempts'] = 1。

<?php
if (blah)
{
    $_SESSION['error'] = "<strong>Details not correct.</strong> Please try again.";
    if(isset($_SESSION['attempts']))
    {
          $_SESSION['fail'] = $_SESSION['attempts']++; //increment
    }
}

登录表单发送到check.php，其中包含函数如果生成错误，则将重定向回登录表单。 ~ @user3464091

如果是这种情况，那么请修改我的代码如下。

说明:在这种情况下，每次提交登录凭据后，它都会来到这个函数。并且，如果$_SESSION['attempts']已经定义。然后，它会增加到1。并且，如果没有设置$_SESSION['attempts']。然后，它将初始值设为1。

[注意:登录成功后不要忘记unset($_SESSION['attempts']);]

<?php
if (blah)
{
  $_SESSION['error'] = "<strong>Details not correct.</strong> Please try again.";
  if(isset($_SESSION['attempts']))
  {
        $_SESSION['fail'] = $_SESSION['attempts']++; //increment
  } else {
        $_SESSION['attempts'] = 1;
  }
}

在将会话值存储在变量中之后对其进行递增。把

$_SESSION['fail'] = $_SESSION['attempts']++;

$_SESSION['fail'] = ++$_SESSION['attempts'];

同时，在$_SESSION['attempts']中存储失败的尝试，否则它不会超过2递增。

$_SESSION['attempts'] = $_SESSION['fail'];

您可以简单地使用:

$_SESSION['fail']= $_SESSION['attempts']+1;

卡住的问题是，它首先定义会话变量，然后执行程序。因此，请确保不要设置变量，除非它还没有设置。

即:

if(!isset($_SESSION['attempts'])) { $_SESSION['attempts']=1;}

<?php 
if (blah)
{
$_SESSION['error'] = "<strong>Details not correct.</strong> Please try again.";     
//$_SESSION['email'] = $email;
if(isset($_SESSION['attempts'])) // check session attempts exist
{
    $_SESSION['fail'] = $_SESSION['attempts']++; //session exist so do increment
}
else
{
    $_SESSION['attempts'] = 1; //  session attempts not exist condition so make first attempt
}

//$_SESSION['fail'] is echo'd on my login form 
}

像

一样使用代码

//from check.php
if (blah)
{
    $_SESSION['error'] = "<strong>Details not correct.</strong> Please try again.";     
    //$_SESSION['email'] = $email;
    if(!isset($_SESSION['attempts']))
    {
        $_SESSION['attempts'] = 1; //first attempt
    }
    else
    {
       $_SESSION['attempts']++; //increment
    }
    $_SESSION['fail'] = $_SESSION['attempts'];
//$_SESSION['fail'] is echo'd on my login form 
}

remove $_SESSION['attempts'] = 1;在你的if条件

应该是这样的…

if(isset($_SESSION['attempts'])) { $_SESSION['fail'] = ++$_SESSION['attempts']; } else { $_SESSION['attempts'] = 1; }