varchar length... PHP

Hello!

Can I get ordered length of the varchar field? I need it in PHP script.

For example,
CREATE TABLE t1
(
   id int,
   str varchar(40)
);

PHP function pg_FieldSize() returns me -1 for field str, because this is
variable length field, but I need got 40 (in the my example). May be
like sizeof() ?????


--
Best regards,
Constantin Khatskevich.