PHP - setcookie(); 不工作

Question

我已经进行了登录,设置了一个带有估算的电子邮件地址值的cookie,所以在global.php文件中,它使用以下方法存储用户数据的数组:

$email = $_COOKIE["PeopleHub"];
$getuserdata = mysqli_query($con, "SELECT * FROM Earth WHERE email='$email'");
$userdata = mysqli_fetch_array($getuserdata, MYSQLI_ASSOC);

cookie没有设置,我知道这是因为我做了一个测试文件:

echo $_COOKIE["PeopleHub"];

它只是一个空白页面.

登录代码(设置cookie的地方):

<?php 
include "global.php";    
?>
<h2>Login</h2>
<?php 
    echo "We currently have <b>" . $usercount . "</b> members, <b>" . $onlinecount . "</b> of which are online. "; 
?>
<br>
<br>
<?php 
    if(isset($_POST["email"])){ 
        $email = $_POST["email"];
        $password = sha1($_POST["password"]);
        $check = mysqli_query($con, "SELECT * FROM Earth WHERE `email`='$email' AND `password`='$password'");
        $check = mysqli_num_rows($check);
        if($check == 1){
        setcookie("PeopleHub", $email, 0, '/');
        echo "We logged you in!";
        }
        else { 
            echo "We couldn't log you in!";
        }
    }
?>
<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="post">
    Email <input name="email" placeholder="Email Address" required="" type="text"><br>
    Password <input name="password" placeholder="Password" required="" type="password"><br>
    <input type="reset" value="Start Over">
    <input type="submit" value="Login">
</form>

Answer 1

您必须在发送任何标头之前设置Cookie .

从手册:

setcookie()定义了一个与其他HTTP头一起发送的cookie.与其他标头一样,必须在脚本的任何输出之前发送cookie(这是协议限制).这要求您在任何输出之前调用此函数,包括和标记以及任何空格.

这意味着如果您希望按原样使用此代码,则需要查看输出缓冲.

<?php

ob_start();
echo "Hello\n";

setcookie("cookiename", "cookiedata");

ob_end_flush();

?>

根据内容global.php,这可能对您有用.我所做的就是在setcookie()调用之前删除任何输出.如果global.php其中包含任何空格或HTML输出,则无效:

<?php 
include "global.php";    

    if(isset($_POST["email"])){ 
        $email = $_POST["email"];
        $password = sha1($_POST["password"]);
        $check = mysqli_query($con, "SELECT * FROM Earth WHERE `email`='$email' AND `password`='$password'");
        $check = mysqli_num_rows($check);
        if($check == 1){
        setcookie("PeopleHub", $email, 0, '/');
        echo "We logged you in!";
        }
        else { 
            echo "We couldn't log you in!";
        }
    }
?>
<h2>Login</h2>
<?php 
    echo "We currently have <b>" . $usercount . "</b> members, <b>" . $onlinecount . "</b> of which are online. "; 
?>
<br>
<br>
<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="post">
    Email <input name="email" placeholder="Email Address" required="" type="text"><br>
    Password <input name="password" placeholder="Password" required="" type="password"><br>
    <input type="reset" value="Start Over">
    <input type="submit" value="Login">
</form>

Answer 2

只是想指出,我遇到了setcookie无法正常工作的问题.当我进一步调查文件时,它被编码为带有BOM的UTF-8.当我将其重新编码为没有BOM的UTF-8时,setcookie工作正常,因此BOM在我遇到第一个php标签之前就被编写了.我想在我的php.ini文件中启用缓冲可能也会解决这个问题.

有人可能最终发现此信息有用.