Synopsis:
   $numitems(<array>)

Technical:
   This function is used to show how many items are currently defined in
   the given array.

Practical:
   This function shows how many items are in an array.  This is quite
   useful, because the number it returns is the next available item number
   in the array.

Returns:
   number of items in array, or empty string if array doesn't exist

See Also:
   Arrays(7); setitem(6)

