int member_array(mixed item, mixed *arr, int step, int start)

Returns the index of the first occurence of <item> in array <arr>.
If not found, then -1 is returned.

The third and the forth argument are optional and determine the step length
and the start index in <arr>.

Example:

To find the description of an item in an items array you could use
this:
	int pos = member_array("item", items, 2);
	if (pos != -1) string desc = items[pos+1];

See also: LPC/arrays