wordpress - PHP session cookies to expire when browser closes -

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i working in wordpress , have following in functions.php page.

i have array of 3 different styles. cookie doing randomizing.

if (isset($_cookie['style'])){     $style = $_cookie['style']; } else {     $style = ($rand[$stylearray]);     setcookie('style',$style,time(),cookiepath,cookie_domain,false);  }

i want set cookie only expires when browser closes. however, seems on page refresh(f5) cookie expires.

is there way set cookie expires on browser close?

the http://www.w3schools.com/php/func_http_setcookie.asp says

optional. specifies when cookie expires. value: time()+86400*30,  set cookie expire in 30 days. if parameter omitted  or set 0, cookie expire @ end of session  (when browser closes). default 0

so

setcookie('style',$style, 0 , ...);

or

setcookie('style',$style, '', ...);

must work.


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