Description:
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From manual page: http://www.php.net/function.setcookie
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I have been searching for an hour why my cookie was not set by

setcookie('user',$value,time()+3600,'/',$SITENAME,0,0);
where $SITENAME equals 'www.qmd.test/'

until I figured out that the trailing slash prevents the cookie from being set.
Maybe this would be helpful to insert into the documentation part of this parameter (domain).

Keep up the good work and Thanks for your work
-m*sh-