Can't connect to 7.4 DB

Hi this php code:

// add to DB

// database access parameters
$host = "localhost";
$user = "postgres";
$pass = "postgres";
$db = "cosc3p94";

// open a connection to the database server
$connection = pg_connect("host=$host dbname=$db user=$user
password=$pass");

if (!$connection)
{
die("Could not open connection to database server");
}

...

results in:

Could not open connection to database server

and I'm not sure why. The web browser, web server, and database are on
the same machine..

I checked the pg_hba.conf and it says this:

# TYPE DATABASE USER IP-ADDRESS IP-MASK
METHOD

local all all
trust
# IPv4-style local connections:
host all all 127.0.0.1 255.255.255.255
trust
# IPv6-style local connections:
host all all ::1
ffff:ffff:ffff:ffff:ffff:ffff:ff$

which is untouched from the default settings...

Michael