function search_review_by_book() { if (filter_input(INPUT_GET, 'book')) { $obj = new books(); $id = sanitize_string(filter_input(INPUT_GET, 'book')); if ($obj->search_reviews($id)) { echo '{"result":1, "reviews":['; $row = $obj->fetch(); while ($row) { echo json_encode($row); if ($row = $obj->fetch()) { echo ','; } } echo ']}'; } else { echo '{"result":0,"message": "Unsuccessful review"}'; } } }