Cookie页面计数器在PHP [英] Cookie page counter in php
问题描述
我正在实施一个PHP页面计数器，它将跟踪用户每次访问此页面时，直到浏览器关闭。我检查看是否设置了cookie，如果是的话。然后我增加它并重置其值。但我遇到的问题是，计数器总是在两个，为什么是这样？
I am implementing a php page counter that will keep track of each time the user visits this page until the browser is closed. I am checking to see if the cookie is set, if it is. Then I am increment it and reset its value. But the problem I am having is that the counter is always at two, why is this?
<html>
<head>
<title>Count Page Access</title>
</head>
<body>
<?php
if (!isset($_COOKIE['count']))
{
?>
Welcome! This is the first time you have viewed this page.
<?php
$cookie = 1;
setcookie("count", $cookie);
}
else
{
$cookie = $_COOKIE['count']++;
setcookie("count", $cookie);
?>
You have viewed this page <?= $_COOKIE['count'] ?> times.
<?php }// end else ?>
</body>
</html>
编辑：感谢大家，我做了增量递增的事情， strong>
Thanks everyone, I did the pre increment thing and got it to work
推荐答案
这是因为 ++ 作为后递增而不是预递增。基本上发生的是你在说，将 $ cookie 设置为 $ _ COOKIE ['count']的值，然后增加 $ _ COOKIE ['count'] 。这意味着每次你设置它只是 $ cookie 等于1，即使 $ _ COOKIE ['count'] 显示为2，您发送的实际Cookie只会等于1。 $ cookie = ++ $ _ COOKIE ['count']; 您应该得到正确的结果。
This is happening because of the ++ being used as a post-increment instead of a pre-increment. Essentially what is happening is you're saying, "set $cookie to the value of $_COOKIE['count'], and then increment $_COOKIE['count']. This means that each time you set it you're only actually making $cookie equal 1, and even though $_COOKIE['count'] is showing it as 2, the actual cookie you send will only equal 1. If you do $cookie = ++$_COOKIE['count']; you should get the correct result.
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