New function: pg_get_socket

This is a patch for 5.2.x to return a select()-able variable for a given PostgreSQL connection. PG allows ASync queries, pg_send_query, and notifications, pg_get_notify. Currently (afaik), there is no way to add a PostgreSQL socket to the event notification array in used with stream_select(); usage: $db=pg_connect(...); $db_socket = pg_get_socket($db); pg_send_query("select 1,pg_sleep(3)"); stream_select($db_socket, ...); pg_get_result($db); feature was requested Jan 2005 on the pg_get_result page of the main English manual. -Charles