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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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