codeigniter get db config values code example

Example: php active_group

$active_group = "";
$active_record = TRUE;
// Ale
$db['ale']['hostname'] = 'localhost';
$db['ale']['username'] = 'root';
$db['ale']['password'] = '';
$db['ale']['database'] = 'eo_ale';
$db['ale']['dbdriver'] = 'mysql';
$db['ale']['dbprefix'] = 'ed_';
$db['ale']['pconnect'] = TRUE;
$db['ale']['db_debug'] = TRUE;
$db['ale']['cache_on'] = FALSE;
$db['ale']['cachedir'] = '';
$db['ale']['char_set'] = 'utf8';
$db['ale']['dbcollat'] = 'utf8_general_ci';
$db['ale']['swap_pre'] = '';
$db['ale']['autoinit'] = TRUE;
$db['ale']['stricton'] = FALSE;


// Sre
$db['sre']['hostname'] = 'localhost';
$db['sre']['username'] = 'root';
$db['sre']['password'] = '';
$db['sre']['database'] = 'eo_sre';
$db['sre']['dbdriver'] = 'mysql';
$db['sre']['dbprefix'] = 'ed_';
$db['sre']['pconnect'] = TRUE;
$db['sre']['db_debug'] = TRUE;
$db['sre']['cache_on'] = FALSE;
$db['sre']['cachedir'] = '';
$db['sre']['char_set'] = 'utf8';
$db['sre']['dbcollat'] = 'utf8_general_ci';
$db['sre']['swap_pre'] = '';
$db['sre']['autoinit'] = TRUE;
$db['sre']['stricton'] = FALSE;