设置cookie并询问投票系统的cookie值答案

【问题标题】：setcookie and ask cookie value for voting system设置cookie并询问投票系统的cookie值
【发布时间】：2015-04-30 00:05:41
【问题描述】：

我想设置一个 cookie，让用户在 4 个类别（悲伤、愤怒、有趣、酷）中只投票一次。我是初学者，所以我知道我的代码非常不方便，但这是我的第一次尝试，所以我或多或少有几行代码对我来说并不重要。由于某种原因，浏览器不会加载 vote.php 文件（当用户单击一个投票选项时调用）。我只是找不到错误...也许有人立即看到它？ [在我插入cookie之前，代码文件加载完美，所以调用不是问题。]

<?php
require_once('connect.php');
$newsid = $_POST['id'];

if (isset($_POST['submit'])) {
    if(isset($_COOKIE['votecookie']) && $_COOKIE['votecookie'] !== 'sad') {
        if($_COOKIE['votecookie'] == 'cool') {  
            $query = mysql_query('UPDATE `index` SET cool=cool-1 WHERE id = {$newsid}');
        }
        if($_COOKIE['votecookie'] == 'funny') { 
            $query = mysql_query('UPDATE `index` SET funny=funny-1 WHERE id = {$newsid}');
        }
        if($_COOKIE['votecookie'] == 'sad') {   
            $query = mysql_query('UPDATE `index` SET enraging=enraging-1 WHERE id = {$newsid}');
        }
        setcookie('votecookie', 'sad');
        $query = mysql_query('UPDATE `index` SET sad=sad+1 WHERE id = '{$newsid}'');
        $hosts = $_SERVER['HTTP_HOST'];
        $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extras = 'news.php?id={$newsid}&sad=1';
        header('Location: http://$hosts$uris/$extras');
        exit;
    }
    if(!isset($_COOKIE['votecookie']) {
            setcookie('votecookie', 'sad');
            $query = mysql_query('UPDATE `index` SET sad=sad+1 WHERE id = '{$newsid}'');
            $hosts = $_SERVER['HTTP_HOST'];
            $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
            $extras = 'news.php?id={$newsid}&sad=1';
            header('Location: http://$hosts$uris/$extras');
            exit;
        }

        if(isset($_COOKIE['votecookie']) && $_COOKIE['votecookie'] == 'sad') {
            $hosts= $_SERVER['HTTP_HOST'];
            $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
            $extras = 'news.php?id={$newsid}&sad=0';
            header('Location: http://$hosts$uris/$extras');
            exit;
        }
        }
    else {
        $hosts= $_SERVER['HTTP_HOST'];
        $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extras = 'news.php?id={$newsid}&sad=0';
        header('Location: http://$hosts$uris/$extras');
        exit;
        ?>

【问题讨论】：

您应该改用会话。用户可以修改和删除cookies
当你在一个只在votecookie 是not sad 时运行的块内时，为什么你有if($_COOKIE['votecookie'] == 'sad')？
关于header('Location: http://$hosts$uris/$extras'); - 因为这些是单引号，所以正在使用文字值 - 它试图重定向到 http://$hosts$uris/$extras。使用双引号解析字符串中的变量。 php.net/manual/en/language.types.string.php
您是否期望第一个 if 块中的 setcookie('votecookie', 'sad') 更新在下一个 if 中测试的 $_COOKIE['votecookie']？ $_COOKIE 仅在您刷新页面时设置。
感谢您的回答。 @Barmar：悲伤的事情确实是一个错误，我纠正了它。对于你的第二个问题：不，我不期望它

标签： php cookies vote

【解决方案1】：

如果有人对答案感兴趣：这就是我现在的做法（我的代码中还有一些错误和推理中的错误）。

<?php
require_once('connect.php');
$newsid = $_POST['id'];
if (isset($_POST['submit'])) {
    if(isset($_COOKIE[$newsid]) && $_COOKIE[$newsid] != 'sad') {
        if($_COOKIE[$newsid] == 'cool') {   
        $query = mysql_query("UPDATE `index` SET cool=cool-1 WHERE id = '{$newsid}'");
        }
        if($_COOKIE[$newsid] == 'funny') {  
        $query = mysql_query("UPDATE `index` SET funny=funny-1 WHERE id = '{$newsid}'");
        }
        if($_COOKIE[$newsid] == 'enraging') {   
        $query = mysql_query("UPDATE `index` SET enraging=enraging-1 WHERE id = '{$newsid}'");
        }
    $query = mysql_query("UPDATE `index` SET sad=sad+1 WHERE id = '{$newsid}'");
    setcookie($newsid, "sad", time() + (10 * 365 * 24 * 60 * 60));
    $hosts = $_SERVER['HTTP_HOST'];
    $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
    $extras = "news.php?id={$newsid}&sad=1";
    header("Location: http://$hosts$uris/$extras");
        exit;
    }
    if(!isset($_COOKIE[$newsid])) {
        $query = mysql_query("UPDATE `index` SET sad=sad+1 WHERE id = '{$newsid}'");
        setcookie($newsid, "sad", time() + (10 * 365 * 24 * 60 * 60));
        $hosts = $_SERVER['HTTP_HOST'];
        $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extras = "news.php?id={$newsid}&sad=1";
        header("Location: http://$hosts$uris/$extras");
            exit;
    }   
    if(isset($_COOKIE[$newsid]) && $_COOKIE[$newsid] == 'sad') {
        $hosts= $_SERVER['HTTP_HOST'];
        $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
        $extras = "news.php?id={$newsid}&sad=0";
        header("Location: http://$hosts$uris/$extras");
            exit;
    }
}
else {
    $hosts= $_SERVER['HTTP_HOST'];
    $uris = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
    $extras = "news.php?id={$newsid}&sad=0";
    header("Location: http://$hosts$uris/$extras");
    exit;
}
?>

【讨论】：

您能具体解释一下您所做的更改吗？很难看出差异。