Array
(
    [1] => 18
    [5] => 20
    [3] => 333333
)

select * from funcname( ARRAY [ ARRAY[ '1','18' ], ARRAY[ '5','20' ], ARRAY[ '3','333333' ] ] )

create or replace function funcname( IN p_attributes_list varchar(255)[][]  ) returns int as
...
   FOREACH next_attribute_value IN ARRAY p_attribute_list
   LOOP