pg_parameter_status() returns boolean FALSE for 'client', 'protocol' and 'server'.
Use pg_version() instead to get the software version numbers and the protocol.
(PHP 5, PHP 7)
pg_parameter_status — Looks up a current parameter setting of the server
$connection
], string $param_name
) : stringLooks 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_status() 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() includes logic to obtain values for server_version and client_encoding anyway. Applications are encouraged to use pg_parameter_status() rather than ad hoc code to determine these values.
On a pre-7.4 PostgreSQL server, changing client_encoding via SET after connection startup will not be reflected by pg_parameter_status().
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() or pg_pconnect().
param_name
Possible param_name values include server_version,
server_encoding, client_encoding,
is_superuser, session_authorization,
DateStyle, TimeZone, and
integer_datetimes.
A string containing the value of the parameter, FALSE on failure or invalid
param_name.
Example #1 pg_parameter_status() example
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
echo "Server encoding: ", pg_parameter_status($dbconn, "server_encoding");
?>
以上例程会输出：
Server encoding: SQL_ASCII
pg_parameter_status() returns boolean FALSE for 'client', 'protocol' and 'server'.
Use pg_version() instead to get the software version numbers and the protocol.
Although PostgreSQL generally recognizes configuration parameters in a case-insensitive fashion (e.g., "SHOW datestyle" shows the "DateStyle" value), the pg_parameter_status() function is case sensitive.