(PHP 4, PHP 5, PHP 7)
pg_pconnect — Open a persistent PostgreSQL connection
pg_pconnect ( string $connection_string [, int $connect_type ] ) : resource
pg_pconnect() opens a connection to a PostgreSQL database. It returns a connection resource that is needed by other PostgreSQL functions.
If a second call is made to pg_pconnect() with the same connection_string
as an existing connection, the existing connection will be returned unless you pass PGSQL_CONNECT_FORCE_NEW
as connect_type
.
To enable persistent connection, the pgsql.allow_persistent php.ini directive must be set to "On" (which is the default). The maximum number of persistent connection can be defined with the pgsql.max_persistent php.ini directive (defaults to -1 for no limit). The total number of connections can be set with the pgsql.max_links php.ini directive.
pg_close() will not close persistent links generated by pg_pconnect().
connection_string
The connection_string
can be empty to use all default parameters, or it can contain one or more parameter settings separated by whitespace. Each parameter setting is in the form keyword = value
. Spaces around the equal sign are optional. To write an empty value or a value containing spaces, surround it with single quotes, e.g., keyword =
'a value'
. Single quotes and backslashes within the value must be escaped with a backslash, i.e., \' and \\.
The currently recognized parameter keywords are: host
, hostaddr
, port
, dbname
, user
, password
, connect_timeout
, options
, tty
(ignored), sslmode
, requiressl
(deprecated in favor of sslmode
), and service
. Which of these arguments exist depends on your PostgreSQL version.
connect_type
If PGSQL_CONNECT_FORCE_NEW
is passed, then a new connection is created, even if the connection_string
is identical to an existing connection.
PostgreSQL connection resource on success, false
on failure.
Example #1 Using pg_pconnect()
<?php $dbconn = pg_pconnect("dbname=mary"); //connect to a database named "mary" $dbconn2 = pg_pconnect("host=localhost port=5432 dbname=mary"); // connect to a database named "mary" on "localhost" at port "5432" $dbconn3 = pg_pconnect("host=sheep port=5432 dbname=mary user=lamb password=foo"); //connect to a database named "mary" on the host "sheep" with a username and password $conn_string = "host=sheep port=5432 dbname=test user=lamb password=bar"; $dbconn4 = pg_pconnect($conn_string); //connect to a database named "test" on the host "sheep" with a username and password ?>
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.pg-pconnect.php