pg_parameter_status

(PHP 5, PHP 7, PHP 8)

pg_parameter_status — Looks up a current parameter setting of the server

说明

pg_parameter_status(PgSql\Connection $connection = ?, string $param_name): string

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_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.

警告

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

参数

connection: An PgSql\Connection instance. When connection is unspecified, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
警告
As of PHP 8.1.0, using the default connection is deprecated.
param_name: Possible param_name values include server_version, server_encoding, client_encoding, is_superuser, session_authorization, DateStyle, TimeZone, and integer_datetimes. Note that this value is case-sensitive.

返回值

A string containing the value of the parameter, false on failure or invalid param_name.

更新日志

版本	说明
8.1.0	现在 `connection` 参数接受 PgSql\Connection 实例，之前接受 resource。

示例

示例 #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");
?>

以上示例会输出：

Server encoding: SQL_ASCII

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