pg_close
pg_connection_busy
PostgreSQL Functions
PHP Manual

# pg_connect

Open a PostgreSQL connection

### Description

resource pg_connect ( string `$connection_string` [, int `$connect_type` ] )

pg_connect opens a connection to a PostgreSQL database specified by the `connection_string`.

If a second call is made to pg_connect 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`.

The old syntax with multiple parameters $conn = pg_connect("host", "port", "options", "tty", "dbname") has been deprecated.

### Parameters

`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` (defaults to value of `user`), `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.

  The `options` parameter can be used to set command line parameters to be invoked by the server.

`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.

### Return Values

PostgreSQL connection resource on success, `FALSE` on failure.

### Examples

Example #1 Using pg_connect

`<?php
$dbconn = pg_connect("dbname=mary");
//connect to a database named "mary"
$dbconn2 = pg_connect("host=localhost port=5432 dbname=mary");
// connect to a database named "mary" on "localhost" at port "5432"
$dbconn3 = pg_connect("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";
$dbconn4 = pg_connect($conn_string);
//connect to a database named "test" on the host "sheep" with a username and password
$dbconn5 = pg_connect("host=localhost options='--client_encoding=UTF8'");
//connect to a database on "localhost" and set the command line parameter which tells the encoding is in UTF-8
?>`

### See Also

- pg_pconnect
- pg_close
- pg_host
- pg_port
- pg_tty
- pg_options
- pg_dbname