I have tried this to make local database connection. But it gives this error:
You have specified an invalid database connection group (ci_test) in your config/database.php file.
$db['default'] = array(
'dsn' => '',
'hostname' => 'localhost', // pass this
'username' => 'root', // pass this
'password' => '', // pass this
'database' => 'ci_test', // pass this
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => TRUE,
'db_debug' => TRUE,
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array());