Exclude null values from COUNT in array

Question

How can I exclude null values from a count on an array? since count always includes null values in the counting!

Answer 1

count(array_filter($array, function($x) {return !is_null($x); })

Answer 2

function count_nonnull($a) {
    $total = 0;
    foreach ($a as $elt) {
        if (!is_null($elt)) {
            $total++;
        }
    }
    return $total;
}