$_SESSION['foo'] 未定义，尽管它应该是 [重复]答案

【问题标题】：$_SESSION['foo'] not defined allthough it should be [duplicate]$_SESSION['foo'] 未定义，尽管它应该是 [重复]
【发布时间】：2017-12-26 00:17:36
【问题描述】：

这真的很烦人，我不明白...我检查了 Isset，如果没有，那么我分配了 veraialbe.. 但是我进行了下一个检查，尽管应该设置 veriable，然后不... 为什么如果没有可验证/索引， if(!isset($_SESSION['foo'] 是否通过嘶嘶声适合，我不明白，这就是 (!isset 不是它的全部意义。无论如何，看看我的代码。可以任何人都知道为什么不设置它的原因..谢谢..

SESSION['登录'] 问题。

        if ($_SESSION['homepage']='001') {$_SESSION['message']==$_SESSION['message']; unset($_SESSION['homepage']);} // if message comes from anything other than the login post

        (!isset($_SESSION['homepage'])) { $_SESSION['message']==$_SESSION['message']}; // if message comes from anything other than the login post

        if (isset($_SESSION['loggedin'])) {$_SESSION['loggedin']=$_SESSION['loggedin'];} else {$_SESSION['loggedin=']='000';}

if (!isset($_SESSION['loggedin'])) {$_SESSION['loggedin']='000';}

        if (!isset($_SESSION['message'])) { $_SESSION['message']='Please Log into an Account';}



if (isset($_POST['email'])) {
unset($_POST['email']);
unset($_POST['confirmemail']);
unset($_POST['password']);
unset($_POST['confirmpassword']);
}
    else
    if (isset($_POST['email'])) {
    unset($_POST['email']);
    unset($_POST['confirmemail']);
    unset($_POST['password']);
    unset($_POST['confirmpassword']);
    }
        else
        if (isset($_POST['confirmemail'])) {
        unset($_POST['email']);
        unset($_POST['confirmemail']);
        unset($_POST['password']);
        unset($_POST['confirmpassword']);
        }
            else
            if (isset($_POST['confirmpassword'])) {
            unset($_POST['email']);
            unset($_POST['confirmemail']);
            unset($_POST['password']);
            unset($_POST['confirmpassword']);
            };


          ........THROWS index not defined here......
if (!isset($_SESSION['loggedin'])) 
{$_SESSION['loggedin']=='000'; 
$_SESSION['message'] = 'You are NOT Logged into your account <br> Please Log in';}

【问题讨论】：

标签： php indexing isset

【解决方案1】：

    if ($_SERVER["REQUEST_METHOD"] == "POST") {

        if ($_SESSION['homepage']='001') {$_SESSION['message']==$_SESSION['message']; unset($_SESSION['homepage']);} // if message comes from anything other than the login post

        (!isset($_SESSION['homepage'])) { $_SESSION['message']==$_SESSION['message']}; // if message comes from anything other than the login post

        if (isset($_SESSION['loggedin'])) {$_SESSION['loggedin']=$_SESSION['loggedin'];} else {$_SESSION['loggedin=']='000';} 

        if (!isset($_SESSION['message'])) { $_SESSION['message']='Please Log into an Account';}

    } else { $_SESSION['loggedin=']='000'; $_SESSION['message']='Please Log into an Account'; }



if (isset($_POST['email'])) {
unset($_POST['email']);
unset($_POST['confirmemail']);
unset($_POST['password']);
unset($_POST['confirmpassword']);
}
    else
    if (isset($_POST['email'])) {
    unset($_POST['email']);
    unset($_POST['confirmemail']);
    unset($_POST['password']);
    unset($_POST['confirmpassword']);
    }
        else
        if (isset($_POST['confirmemail'])) {
        unset($_POST['email']);
        unset($_POST['confirmemail']);
        unset($_POST['password']);
        unset($_POST['confirmpassword']);
        }
            else
            if (isset($_POST['confirmpassword'])) {
            unset($_POST['email']);
            unset($_POST['confirmemail']);
            unset($_POST['password']);
            unset($_POST['confirmpassword']);
            };



if (!isset($_SESSION['loggedin'])) 
{$_SESSION['loggedin']='000'; 
$_SESSION['message'] = 'You are NOT Logged into your account <br> Please Log in';}

我是 == 而不是 = 。另外，我添加了一个检查是否发布。感谢您的审核。

【讨论】：