pg_port - PHP code example

Using the PHP Function pg_Port to Connect to PostgreSQL

A function is a small piece of code that can be used repeatedly throughout your application. It’s a powerful tool that allows you to write modular and reusable software. PHP provides many built-in functions that you can use to perform common programming tasks. You can also create your own custom functions if necessary.

The pg_port function is one of the most important PHP routines that you can use to work with PostgreSQL from within your application. It opens a connection to the specified database if the connect_type parameter is set to PGSQL_CONNECT_FORCE_NEW; otherwise, it uses the existing connection. It accepts a variety of parameters, including hostname, port, dbname, user, password, connect_timeout, options, tty, requiressl (deprecated), and service.

The return value of the pg_port function is a string indicating the status of the connection. It can contain the following information:

An error message indicating that the server was unable to bind to the port specified by the pg_port() call. This can occur if the operating system blocks ports below 1024 or if the port is already in use by another process.

An error message indicating that the internally generated command sent to the database was not understood. This could be a result of an internal query, for example, issued by a PL/pgSQL function.

pg_port example

$a['busy'] = pg_connection_busy($link);

        $a['transaction'] = pg_transaction_status($link);
        if (isset(self::TRANSACTION_STATUS[$a['transaction']])) {
            $a['transaction'] = new ConstStub(self::TRANSACTION_STATUS[$a['transaction']], $a['transaction']);
        }

        $a['pid'] = pg_get_pid($link);
        $a['last error'] = pg_last_error($link);
        $a['last notice'] = pg_last_notice($link);
        $a['host'] = pg_host($link);
        $a['port'] = pg_port($link);
        $a['dbname'] = pg_dbname($link);
        $a['options'] = pg_options($link);
        $a['version'] = pg_version($link);

        foreach (self::PARAM_CODES as $v) {
            if (false !== $s = pg_parameter_status($link, $v)) {
                $a['param'][$v] = $s;
            }
        }

        $a['param']['client_encoding'] = pg_client_encoding($link);