member_array - returns index of an occurence of a given item in an array or string

int member_array( mixed item, mixed arr);

int member_array( mixed item, mixed arr, int start);

Returns the index of the first occurence of `item' in the array  or string
`arr', or the first occurence at or after 'start'.
If the item is not found, then -1 is returned.

For the purpose of this efun, strings are considered to be arrays of ints.

 Tim Hollebeek  Beek@ZorkMUD, Lima Bean, IdeaExchange, and elsewhere
