Will Non-Existent Sessions always return FALSE?

[snday]

I'm pretty sure the answer is yes, but want to be certain.

Let me try to explain if you dont already understand from the title.

I create a default session value for a user on my site, lets say the value is:
$_SESSION['is_logged'] = TRUE;

I then do certain checks with this session.
Lets say I do not want a user to see something IF $_SESSION['is_logged'] == FALSE;

When a user first visits the website, no session is created, but will on next pageload.
Same for many Bots.. they dont generate sessions.
So if I want to check $_SESSION['is_logged'] == FALSE;
will it always return FALSE if that session is not there/not created?

[trq]

[code=php:0]$_SESSION['is_logged'] == FALSE[/code]

Will allways return TRUE if the session has not been set. (Be carefull how you word things)

[snday]

[quote author=thorpe link=topic=116341.msg473963#msg473963 date=1164548347]
[code=php:0]$_SESSION['is_logged'] == FALSE[/code]

Will allways return TRUE if the session has not been set. (Be carefull how you word things)
[/quote]

crap,
what I ment was the reverse.

Basically I am wondering....
If a Session is NOT created, it will always return FALSE if checking for it correct?

[trq]

it will also generate a warning, your best to use....
[code=php:0]
if (isset($_SESSION['is_logged')) {
  // is set
} else {
  // not set
}
[/code]

[snday]

thanks  :)