stored procedures and type of returned result.

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Hello,

I'm new in PostgreSQL. It's very cool.

I would like to know how to return a set of records from a stored procedure.

For example, i would like to execute these sql command from a stored 
procedure :

select t.typnum, t.typcom, t.typcateg, s.symurlgraph from structure.type t  left join structure.symbole s  on t.typcode
=s.typcode;
 

Is it possible ?
Do i have to return results in an array ?
If yes, how could i do ?

Do you think using plPHP mays help me ?

Regards,
Patrice OLIVER.