$data["uid"] = "The user does not exist in the database!"; echo json_encode($data); } } else { if ($mode == 'addMessage') { /** * According to the logic of the Android program * at this point we already have the topic_id * and the posted_by that will be set when the program opens * by calling the function getUserDetails($name) */ if (isset($_POST['content']) && $_POST['post_topic'] && $_POST['posted_by'] && $_POST['content'] != '' && $_POST['post_topic'] != '' && $_POST['posted_by'] != '') { $content = $_POST['content']; $post_topic = $_POST['post_topic']; $posted_by = $_POST['posted_by']; $success = $database->insertMessage($content, $post_topic, $posted_by); if ($success) { $data["success"] = 1; $data["error"] = 0; $data["message"] = "A new message was inserted in the database!"; echo json_encode($data); } else { $data["success"] = 0; $data["error"] = 1; $data["error_message"] = "It was not possible to insert the message in the database!"; echo json_encode($data); } } } else { if ($mode == 'deleteTopic') { if (isset($_POST['topic_id']) && $_POST['topic_id'] != '' && isset($_POST['user_name']) && $_POST['user_name'] != '') {