Why count(false) return 1?

Question

Do you know why <?= count(false) ?> returns 1?

Answer 1

It's specified behavior:

If var is not an array or an object with implemented Countable interface, 1 will be returned.

According to http://php.net/manual/en/function.count.php

Answer 2

Because false is also a value and if the count() does not get array but a valid variable it returns true which is 1.

$result = count(null);
// $result == 0

$result = count(false);
// $result == 1