为什么这个变量总是返回true？

Question

I am trying to write a login script. After logging in a session variable is set, and on the main page, the isLoggedIn function is run. The problem is, that the variable $loggedIn is always returning true. Can someone help?

function validateUser($user)
{
    if(isset($user)){
    session_regenerate_id ();//this is a security measure
    $_SESSION['logged'] = 1;
    $_SESSION['userid'] = $user;}
}
//Validates Login
function isLoggedIn()
{
    if($_SESSION['logged'] = 1)
        return true;
    return false;
}

$loggedIn = isLoggedIn();

if($loggedIn){ SHOW CONTENT FOR LOGGED IN USERS }

else { show content for users not logged in }

Answer 1

You are using the assignment operator = instead of a conditional operator == .

It's supposed to be:

if ($_SESSION['logged'] == 1)
    return true;

The result of an assignment = is the right hand side expression, which is 1, which is always true in this case. :)

Answer 2

it's because you're setting $_SESSION['logged'] with the single equals. Use a double equals instead:

function isLoggedIn()
{
    if($_SESSION['logged'] == 1)
        return true;
    return false;
}

Answer 3

function isLoggedIn() { if($_SESSION['logged'] = 1)//assigned value '1' to $_SESSION['logged'] so in this if condition it is checking if there is any value is $_SESSION['logged'], which will be true for all the cases (valid/invalid) return true; return false; }

$loggedIn = isLoggedIn();/those the value for $loggedIn will be always true

change the if($_SESSION['logged'] = 1) to if($_SESSION['logged'] == 1)

Answer 4

不是这个 （$ _ SESSION ['logged'] = 1）这是正确的 - > if（$ _ SESSION ['logged'] == 1）