int pg_connect (string host, string port, string options, string tty, string dbname)
Returns a connection index on success, or false if the connection could not be made. Opens a connection to a PostgreSQL database. Each of the arguments should be a quoted string, including the port number. The options and tty arguments are optional and can be left out. This function returns a connection index that is needed by other PostgreSQL functions. You can have multiple connections open at once.
A connection can also established with the following command: $conn = pg_connect("dbname=marliese port=5432"); Other parameters besides dbname and port are host, tty, options, user, and password.
See also pg_pconnect().