SET ANSI_NULLS

I am trying to set the ANSI_NULLS, ANSI_WARNINGS on my SQL connection
from PHP.

I have check the connection through profiler and it's defaults are

-- network protocol: TCP/IP
set quoted_identifier off
set implicit_transactions off
set cursor_close_on_commit off
set ansi_warnings off
set ansi_padding off ******
set ansi_nulls off ******
set concat_null_yields_null off
set language British
set dateformat dmy
set datefirst 1

Does anyone know where I can change the two marked settings short of
ammending all my scripts to use the SET ANSI_NULLS ON for each sql
script?

Cheers