<?php

class db {

    private $dbhost = "mysql.hostinger.com.ar";
    private $dbuser = "(mi usuario)";
    private $dbpass = "(mi pass)";
    private $dbname = "(mi bd)";

    public function connect(){
        $mysql_connect_str = "mysql:host=$this->dbhost;dbname=$this->dbname";
        $dbConnection = new PDO($mysql_connect_str, $this->dbuser, $this->dbpass);
        $dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        return $dbConnection;
    }
}

<?php

use PsrHttpMessageServerRequestInterface as Request;
use PsrHttpMessageResponseInterface as Response;


$app->group('/usuario/', function () {

$app = new SlimApp;

$this-> get('', function(Request $request, Response $response){

    $sql = "select * from usuario";

    try{
        $db = new db();

        $db = $db->connect();

        $stmt = $db->query($sql);
        $usuario = $stmt->fetchAll(PDO::FETCH_OBJ);
        $db = null;
        echo json_encode($usuario);

    } catch(PDOException $e){
        echo '{"error": {"text": '.$e->getMessage(). '}';
    }
});

RewriteEngine On
# Some hosts may require you to use the `RewriteBase` directive.
# If you need to use the `RewriteBase` directive, it should be the
# absolute physical path to the directory that contains this htaccess file.
#
# RewriteBase /
Header add Access-Control-Allow-Origin "*"
Header add Access-Control-Allow-Headers "origin, x-requested-with, content-type"
Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]

<?php
use PsrHttpMessageServerRequestInterface as Request;
use PsrHttpMessageResponseInterface as Response;

require '../vendor/autoload.php';
require '../app/config/db.php';


$app = new SlimApp(["settings" => $config]);
$container = $app->getContainer();
$capsule = new Capsule;
$capsule->addConnection($config['db']);
$capsule->setEventDispatcher(new Dispatcher(new Container));
$capsule->bootEloquent();

require '../app/route/usuario.php';

$app->run();