Going through my entire $_SESSION array and removing null variables

Question

I've been doing some tests with $_SESSION variables and that left a lot of them set to NULL, but still existing. I can remove them one-by-one, but how can I just loop through the $_SESSION array and remove NULL variables quickly?

Answer 1

You can use array_filter with a callback function that uses is_null:

$output = array_filter($input, function($val) { return !is_null($val); });