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When writing a logout script in PHP what steps should i take? Should i:

1.) unset all session vars like:  

 unset($_SESSION["var1"]);
 unset($_SESSION["var2"]);

or calls   

session_unset();

2.) destroy session cookie like:

setcookie(session_name(), "NULL", time()-60, $params['path'], $params['domain'], $params['secure'], isset($params['httponly']));

3.) finally destroy the session data by calling

session_destroy();

or maybe just only unset the session vars - that is making only the first step?

I'm asking because I've seen many logout scripts that doesn't involve these 3 steps (i most cases doing only the first one as i stated)

Thx. for help.

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