if (array_key_exists($key, $arr)
$arr[$key] = $arr[$key] + $value
else
$arr[$key] = $value
if(date('d-m-Y', $_COOKIE['lastVisit']) != date('d-m-Y')){
setcookie("visitCounter", "$visitCounter", 0x7FFFFFFF);
setcookie('lastVisit', time(), 0x7FFFFFFF);
$visitCounter++;
}