session_unset($_SESSION['ordercompleted']); why does it unset all sessoin data?

Yes I am trying to unset this session variable session_unset($_SESSION['ordercompleted']); only, but it unsets everything. Why does this happen for?

 

It's because that function ('session_unset') doesn't take any parameters, its purpose is to unset all session variables. Instead use

unset($_SESSION['ordercompleted'])

Code (markup):

or

$_SESSION['ordercompleted'] = null

Code (markup):

(or however you want it).

 

Just FYI: If you are not sure how something works, check the manual on php.net

http://at2.php.net/manual/en/index.php

Code (markup):

 

i also use this

source: _http://php.net/manual/en/function.unset.php