index.php

  <?php

  require 'vendor/autoload.php';
  require 'dbconfig.php';

  $app = new Slim\App();

  //slim application routes
  $app->get('/', function ($request, $response, $args) {
   $response->write("Welcome to RESTful API Webservices");
   return $response;
  });

  $app->get('/demo', function ($request, $response, $args) {
   $response->write("Hello Demo Content!");
   return $response;
  });

  $app->get('/users', 'getUsers');

  $app->get('/users/{id}', function ($request, $response, $args) {
  	getUser($args['id']);
  });

  $app->post('/users', 'addUser');
  $app->put('/users/:id', 'updateUser');
  $app->delete('/users/:id', 'deleteUser');
  $app->run();

  function getUsers() {
  	$sql_query = "select * FROM users ORDER BY user_name";
      $dbCon = connect_db();
      $sql_exe = $dbCon->query($sql_query);
      $users = $sql_exe->fetch_all(MYSQLI_ASSOC);
      $dbCon = null;
      echo '{"users": ' . json_encode($users) . '}';
  }

  function getUser($id) {
  	$sql_query = "select * FROM users WHERE users_id=$id";
      $dbCon = connect_db();
      $stmt = $dbCon->query($sql_query);
      $user = $stmt->fetch_all(MYSQLI_ASSOC);
      $dbCon = null;
      echo '{"user": ' . json_encode($user) . '}';
  }
?>