undefined $username using $_SESSION

Question

I am programming in PHP.

I want to do a page that if the user didn't signed in, the system will say "Hello Guest" and if he signed in, the system will say "Hello $username".

It's working, however, when I entered the system for the first time I receive a error undefined $Username. After I refresh the page or going to another page it's working good - the problem is in the first time.

The $username received in the login page and there is session_start();.

This code is from the page I am trying to do the Hello Username:

<?php
    if (!isset($_SESSION))
        session_start();

    if ($_SESSION["Username"] == "")
        $_SESSION["Username"] = "Guest";    
?>

Need help

the code you posted doesn't support the question/error. `undefined $Username` unless you meant (minus the $ sign) `undefined Username` — Funk Forty Niner, May 16 '16 at 12:12

score 1 · Accepted Answer · answered May 16 '16 at 12:15

1

you should isset()

<?php
if (!isset($_SESSION))
    session_start();

if (!isset($_SESSION["Username"]))
    $_SESSION["Username"] = "Guest";    
?>

answered May 16 '16 at 12:15

Naresh Kumar

561
2
15

score 0 · Answer 2 · edited May 16 '16 at 12:32

0

Wherever you have used $username you have to check if it exist using

if(isset($username)){

}

If not then you have to set it.

edited May 16 '16 at 12:32

Lithin Kuriachan

43
8

answered May 16 '16 at 12:14

Amit Ray

3,445
2
19
35

undefined $username using $_SESSION

2 Answers2