$ _SESSION ['foo']没有定义，尽管它应该是[重复]

Question

这个问题在这里已有答案：

• The 3 different equals 5个答案

这真的很烦人，我不明白... Icheck the Isset然后我分配veraialbe ..但我接下来检查，尽管可靠的应该设置它然后不...而为什么if （！isset（$ _ SESSION ['foo']如果没有可靠的/索引，我没有得到它，那就是整个点（！isset aint it ..无论如何，看看我的代码。可以任何人看到一个为什么这不会被设置..谢谢..

SESSION ['loggedin']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';}

Answer 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=。加上我添加了支票，如果发布。感谢REVIEW。