php man page for pg_parameter_status

PG_PARAMETER_STATUS(3)													    PG_PARAMETER_STATUS(3)

pg_parameter_status - Looks up a current parameter setting of the server.

SYNOPSIS
       string pg_parameter_status ([resource  $connection], string  $param_name)

DESCRIPTION
	Looks up a current parameter setting of the server.

	Certain parameter values are reported by the server automatically at connection startup or whenever their values change. pg_parameter_sta-
       tus(3) can be used to interrogate these settings. It returns the current value of a parameter if known, or FALSE if the	parameter  is  not
       known.

	Parameters  reported  as  of PostgreSQL 8.0 include server_version, server_encoding, client_encoding, is_superuser, session_authorization,
       DateStyle, TimeZone, and integer_datetimes. ( server_encoding, TimeZone, and integer_datetimes were not reported by releases  before  8.0.)
       Note that server_version, server_encoding and integer_datetimes cannot change after PostgreSQL startup.

	PostgreSQL  7.3  or lower servers do not report parameter settings, pg_parameter_status(3) includes logic to obtain values for server_ver-
       sion and client_encoding anyway. Applications are encouraged to use pg_parameter_status(3) rather than ad hoc code to determine these  val-
       ues.

       Caution

	       On  a  pre-7.4  PostgreSQL  server,  changing  client_encoding via SET after connection startup will not be reflected by pg_parame-
	      ter_status(3).

PARAMETERS
	      o $connection
		- PostgreSQL database connection resource. When $connection is not present, the default connection is used. The default connection
		is the last connection made by pg_connect(3) or pg_pconnect(3).

	      o $param_name
		-  Possible $param_name values include server_version, server_encoding, client_encoding, is_superuser, session_authorization, Dat-
		eStyle, TimeZone, and integer_datetimes.

RETURN VALUES
       A string containing the value of the parameter, FALSE on failure or invalid $param_name.

EXAMPLES
       Example #1

	      pg_parameter_status(3) example

	      <?php
		$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

		echo "Server encoding: ", pg_parameter_status($dbconn, "server_encoding");
	      ?>

	      The above example will output:

	      Server encoding: SQL_ASCII

PHP Documentation Group 												    PG_PARAMETER_STATUS(3)