Count Similar Array Keys

Question

I have a POST request coming to one of my pages, here is a small segment:

[shipCountry] => United States
[status] => Accepted
[sku1] => test
[produc         


        

Answer 1

Well, if you know that every product will have a corresponding array key matching "productN", you could do this:

$productKeyCount = count(preg_grep("/^product(\d)+$/",array_keys($_POST)));

preg_grep() works well on arrays for that kind of thing.