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This statement is not returning results to my index.php page.  In fact the page will not even open.    order.php

<?php
namespace Phppot;

use Phppot\DataSource;

class Order
{

    private $ds;

    function __construct()
    {
        require_once __DIR__ . '../lib/DataSource.php';
        $this->ds = new DataSource();
    }

    function getAllOrders()
    {
        $query = "SELECT * FROM tbl_session";
        $result = $this->ds->select($query);
        return $result;
    }

    function getPdfGenerateValues($id)
    {
        //$query = "SELECT * FROM tbl_session WHERE therapist_id='" . $id . "'";
      $query = "SELECT * FROM tbl_session WHERE therapist_id=1";
        $result = $this->ds->select($query);
        return $result;
    }

    function getOrderItems($session_id)
    {
        $sql = "SELECT
   tbl_session.session_id, 
   tbl_session.session_date, 
   tbl_session.session_type, 
   tbl_session.session_status, 
   tbl_therapist.therapist_name, 
   tbl_therapist.therapist_street, 
   tbl_therapist.therapist_city, 
   tbl_therapist.therapist_state, 
   tbl_therapist.therapist_zip_code, 
   tbl_therapist.therapist_indy_fee, 
   tbl_therapist.therapist_couple_fee, 
   tbl_therapist.therapist_group_fee, 
   tbl_client.client_name
FROM
   tbl_session
   INNER JOIN
   tbl_therapist
   ON 
      tbl_session.therapist_id = tbl_therapist.therapist_id
   INNER JOIN
   tbl_client
   ON 
      tbl_session.client_id = tbl_client.client_id
WHERE
   tbl_session.session_status = Completed";
    }

}

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index.php

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