(PHP 4, PHP 5, PHP 7)

pg_pconnectOpen a persistent PostgreSQL connection


resource pg_pconnect ( string $connection_string [, int $connect_type ] )

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().



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.


If PGSQL_CONNECT_FORCE_NEW is passed, then a new connection is created, even if the connection_string is identical to an existing connection.

Return Values

PostgreSQL connection resource on success, FALSE on failure.


Example #1 Using pg_pconnect()

//connect to a database named "mary"

$dbconn2 pg_pconnect("host=localhost port=5432 dbname=mary");
// connect to a database named "mary" on "localhost" a class="parlsistent" clp"mary" on ;;;;;;;p> tylep0000BB">$dbconn2 , =foot;?php
pg_pconnect"host=locassst=locr: #0000BB"tylep 000">"alue00BB">pg_pconds aan s00BB">pnd0000BB"code>, span>);
yle=t> tyle="color: #FF8000">// connect to a database namedbsp;;;;;;;;p> tylep0000BB">$dbconn2 , =bart;?php
// connect to a database named "mary" on "localhost" a class="parlsistent" clp"mary" on&n/>yle=t> ;?php
$dbconn pg_pconnect"host=locassst=locr: #0000BB"tylep 000">"alue00BB">pg_pconds aan s00BB">pnd0000BB"code>, span> s="type">

Return Values PostgrSee Alsonection resource on success, a href="/"av id=l Ion failu
  • - class=">

  • Using remote sownloadhref='reroefsect1-funcct1-fu s
  • ds aarount