function get_purchases_control() { if (filter_input(INPUT_GET, 'user')) { $obj = new books(); $user = sanitize_string(filter_input(INPUT_GET, 'user')); if ($obj->get_purchases($user)) { echo '{"result":1, "purchases":['; $row = $obj->fetch(); while ($row) { echo json_encode($row); if ($row = $obj->fetch()) { echo ','; } } echo ']}'; } else { echo '{"result":0,"message": "Unsuccessful query"}'; } } }