Switch database based on parameter

not helped. Solution is change database.php as follow

PHP Code:

if (isset($_GET['cfg'])) {
    $efg = (int) $_GET['cfg'];
} else {
    $efg = 1;
}

$dbh = new PDO('mysql:host=localhost;dbname=chat', 'root', '');

$sql = 'SELECT db_user,db_name,db_pass FROM clients WHERE id=?';

$sth = $dbh->prepare($sql);
$sth->execute(array($efg));
$d_result = $sth->fetchAll(PDO::FETCH_ASSOC);
//var_dump($d_result);
// We are done with PDO for this purpose so free up some resources!
$dbh = null;
unset($dbh);

$db['default'] = array(
    'dsn' => '',
    'hostname' => 'localhost',
    'username' => $d_result[0]['db_username'],
    'password' => $d_result[0]['db_pass'],
    'database' => $d_result[0]['db_name'],
.... 


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