11-02-2018
How can you connect to a database without a userid and password for the database?
Your script does not seem to perform the basic connection call with the right parameters; and that is also what the error message indicates.
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LEARN ABOUT PHP
pg_connect
PG_CONNECT(3) PG_CONNECT(3)
pg_connect - Open a PostgreSQL connection
SYNOPSIS
resource pg_connect (string $connection_string, [int $connect_type])
DESCRIPTION
pg_connect(3) opens a connection to a PostgreSQL database specified by the $connection_string.
If a second call is made to pg_connect(3) 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
o $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.
o $connect_type
- If PGSQL_CONNECT_FORCE_NEW is passed, then a new connection is created, even if the $connection_string is identical to an exist-
ing connection.
RETURN VALUES
PostgreSQL connection resource on success, FALSE on failure.
EXAMPLES
Example #1
Using pg_connect(3)
<?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(3), pg_close(3), pg_host(3), pg_port(3), pg_tty(3), pg_options(3), pg_dbname(3).
PHP Documentation Group PG_CONNECT(3)