$cards = range(1, 52);
function pc_array_range($start, $stop, $step) { $array = array(); for ($i = $start; $i <= $stop; $i += $step) { $array[] = $i; } return $array; }
$odd = pc_array_range(1, 52, 2);
$even = pc_array_range(2, 52, 2);