pg_field_size

Hi,
I wish to set on screen field sizes by using pg_field_size().
I have been successful with odbc_field_len() connected to Postgres but
wish to convert to pg_ functions.
Problem: all of these fields return -1 (indicating variable length):
CREATE TABLE menu_lines (
    systemcode char (2) ,
    menuname char (32) ,
    menuline char (2) ,
    description varchar (32) ,
    accesscode char (1) ,
    accesstype char (1) ,
    programname varchar (32) ,
    formatfile varchar (32) ,
With char(2) should pg_field_size() return 2?
odbc_field_len() does return 2!
I am using PHP 4.2.3.
Any comments please.
Kevin Gordon.