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Script 16.9 Logout.php Cookie Question

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On page 516 script 16.9:


Line 20: setcookie (session .... //DESTROYS COOKIE


This line destroys a cookie set earlier (that was set in login.php? or in the Header?)


However I cannot find the corresponding cookie that was set. The value, i see, is PHPSESSID


thank you


Also, is it always necessary to set a cookie when using a Session?



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Ah! The cookie would have been set in the header file when the session is started. It's not obligatory to unset this but would make it more secure (because it requires that a new session is begun afterwards). 

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