Stored Procedure: Function returns Array

Question

I was just wondering if following scenario is possible in a stored procedure.
I have a package, which includes 4 different functions and 1 procedure. Procdure uses ref cursor to return values in my reporting tool. What I am trying to do is to write a function which takes input and return array of varchar. Something like..
Package ABC
Function student_classes (student_no in Varchar2) return [array]
begin
select class_nbr into [array]
from student_table
where student_nbr = student_no;
return [array];
end student_classes;
procedure students_info (rpt_cursor IN OUT rpt_type)
begin
OPEN rpt_cursor FOR
select
student_name,
student_nbr,
student_address,
student_classes (student_nbr) --returns array
from student_table;
end student_info; --end of procedure
end abc; --end of pacakge.
I used [array], as I am ont sure how to define (syntax) it in spec part of package or in body. I will really appreciate if someone could help me with this function.
Thank you

Answer 1

Thanks for the reply Tonguc Y.
I declared an array in my package declaration
CREATE OR REPLACE PACKAGE rpt_TESTING_pkg
AS TYPE rpt_type IS REF CURSOR;
     TYPE DIAGARRAY IS VARRAY(20) OF VARCHAR2(6);
     FUNCTION DIA_CODES (MNO IN VARCHAR2) RETURN DIAGARRAY;
     PROCEDURE member (rpt_cursor IN OUT rpt_type);
END rpt_TESTING_pkg;
but then when I try to use it in my function it gives me error that I should declare DIAGARRAY.
CREATE OR REPLACE PACKAGE BODY rpt_TESTING_pkg
as
FUNCTION DIA_CODES (MNO IN VARCHAR2)
               RETURN DIGARRAY AS diags DIGARRAY;
begin
<sql block>
end dia_codes;
end rpt_TESTING_pkg;
Any suggestions.