source: extensions/database_migration/include/functions.inc.php

<?php
// +-----------------------------------------------------------------------+
// | database_migration - a plugin for Piwigo                              |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2010 Nicolas Roudaire             http://www.nikrou.net  |
// +-----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify  |
// | it under the terms of the GNU General Public License version 2 as     |
// | published by the Free Software Foundation                             |
// |                                                                       |
// | This program is distributed in the hope that it will be useful, but   |
// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
// | General Public License for more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,            |
// | MA 02110-1301 USA                                                     |
// +-----------------------------------------------------------------------+

function get_config_file_content($dblayer, $connection) {
  global $conf;
  
  $content = '<?php
$conf[\'dblayer\'] = \''.$dblayer.'\';
$conf[\'db_base\'] = \''.$connection['db_base'].'\';
$conf[\'db_user\'] = \''.$connection['db_user'].'\';
$conf[\'db_password\'] = \''.$connection['db_password'].'\';
$conf[\'db_host\'] = \''.$connection['db_host'].'\';

$prefixeTable = \''.$connection['prefix'].'\';

define(\'PHPWG_INSTALLED\', true);
define(\'PWG_CHARSET\', \'utf-8\');
define(\'DB_CHARSET\', \'utf8\');
define(\'DB_COLLATE\', \'\');
?>';

  return $content;
}

function save_mysql_config() {
  global $me, $conf, $prefixeTable;

  $connection['db_host'] = $conf['db_host'];
  $connection['db_user'] = $conf['db_user'];
  $connection['db_password'] = $conf['db_password'];
  $connection['db_base'] = $conf['db_base'];
  $connection['prefix'] = $prefixeTable;
  $me->addConnection('mysql', $connection);
  $me->save_config();
}
?>