为什么此代码不能正确增加计数器? [英] Why does this code not increment a counter properly?

问题描述

在我下面的代码中，为什么不是每次都将整数加一?例如，假设我提交表单时有 1 OF 5.提交后，应该是2 OF 5，而是显示5 OF 5.即使我将最大值从 5 更改为 3，也会发生这种情况；它从 1 OF 3 开始并立即跳转到 3 OF 3.这是显示 .. OF ..

In my code below, why is it not incrementing the integers by one each time? For example, say I have 1 OF 5 when I submit the form. After submission, it should be 2 OF 5, but instead, it displays 5 OF 5. This occurs even if I change the maximum from 5 to 3; it starts at 1 OF 3 and jumps immediately to 3 OF 3. This is the code to display the .. OF ..

<h1><?php echo $sessionMinus ?> OF <?php echo $_SESSION['initial_count'] ?></h1>

下面是每次将值加一的代码:

Below is the code which should increment the value by one each time:

if(isset($_POST['sessionNum'])){
  //Declare my counter for the first time

  $_SESSION['initial_count'] = $_POST['sessionNum'];
  $_SESSION['sessionNum'] = $_POST['sessionNum'];
  $_SESSION['sessionCount'] = 1;
}
else if ($_SESSION['sessionCount'] < $_SESSION['sessionNum']) {
    $_SESSION['sessionCount']++;
}

$sessionMinus =  $_SESSION['sessionCount'];

推荐答案

代码看起来不错.但是，该页面可能在您不知情的情况下在后台被请求.例如，损坏的图像路径等可能会落在此文件上，因此会增加您的计数器.为了确保不是这种情况，请添加一个新的会话数组 var 来记录 $_SERVER['REQUEST_URI'] 或将其记录到文本文件或其他内容中.

The code looks fine. However it is possible that the page is being requested in the background without your knowing. For instance a broken image path etc could be landing on this file hence incrementing your counter. To make sure thats not the case, add a new session array var which records the $_SERVER['REQUEST_URI'] or log it to a text file or something.

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