Example::users_get PHP Method

    public function users_get()
    {
        // Users from a data store e.g. database
        $users = [['id' => 1, 'name' => 'John', 'email' => '[email protected]', 'fact' => 'Loves coding'], ['id' => 2, 'name' => 'Jim', 'email' => '[email protected]', 'fact' => 'Developed on CodeIgniter'], ['id' => 3, 'name' => 'Jane', 'email' => '[email protected]', 'fact' => 'Lives in the USA', ['hobbies' => ['guitar', 'cycling']]]];
        $id = $this->get('id');
        // If the id parameter doesn't exist return all the users
        if ($id === NULL) {
            // Check if the users data store contains users (in case the database result returns NULL)
            if ($users) {
                // Set the response and exit
                $this->response($users, REST_Controller::HTTP_OK);
                // OK (200) being the HTTP response code
            } else {
                // Set the response and exit
                $this->response(['status' => FALSE, 'message' => 'No users were found'], REST_Controller::HTTP_NOT_FOUND);
                // NOT_FOUND (404) being the HTTP response code
            }
        }
        // Find and return a single record for a particular user.
        $id = (int) $id;
        // Validate the id.
        if ($id <= 0) {
            // Invalid id, set the response and exit.
            $this->response(NULL, REST_Controller::HTTP_BAD_REQUEST);
            // BAD_REQUEST (400) being the HTTP response code
        }
        // Get the user from the array, using the id as key for retreival.
        // Usually a model is to be used for this.
        $user = NULL;
        if (!empty($users)) {
            foreach ($users as $key => $value) {
                if (isset($value['id']) && $value['id'] === $id) {
                    $user = $value;
                }
            }
        }
        if (!empty($user)) {
            $this->set_response($user, REST_Controller::HTTP_OK);
            // OK (200) being the HTTP response code
        } else {
            $this->set_response(['status' => FALSE, 'message' => 'User could not be found'], REST_Controller::HTTP_NOT_FOUND);
            // NOT_FOUND (404) being the HTTP response code
        }
    }