prestashop ORDERS AND MESSAGES sending using php

[TestUser123]

I would like to change order status using php AND then send proper email... ALL using PHP

where can i begin to educate myself?

Thnx in advance!

AG

[Knowband Plugins]

File Path: /controller/admin/adminorderscontroller.php

Function: postprocess()

In above function please check the below code which can use for changing the order status and sending respective emails using PHP.

elseif (Tools::isSubmit('submitState') && isset($order)) {
            /* Change order status, add a new entry in order history and send an e-mail to the customer if needed */
            if ($this->access('edit')) {
                $order_state = new OrderState(Tools::getValue('id_order_state'));

                if (!Validate::isLoadedObject($order_state)) {
                    $this->errors[] = $this->trans('The new order status is invalid.', array(), 'Admin.Orderscustomers.Notification');
                } else {
                    $current_order_state = $order->getCurrentOrderState();
                    if ($current_order_state->id != $order_state->id) {
                        // Create new OrderHistory
                        $history = new OrderHistory();
                        $history->id_order = $order->id;
                        $history->id_employee = (int) $this->context->employee->id;

                        $use_existings_payment = false;
                        if (!$order->hasInvoice()) {
                            $use_existings_payment = true;
                        }
                        $history->changeIdOrderState((int) $order_state->id, $order, $use_existings_payment);

                        $carrier = new Carrier($order->id_carrier, $order->id_lang);
                        $templateVars = array();
                        if ($history->id_order_state == Configuration::get('PS_OS_SHIPPING') && $order->shipping_number) {
                            $templateVars = array('{followup}' => str_replace('@', $order->shipping_number, $carrier->url));
                        }

                        // Save all changes
                        if ($history->addWithemail(true, $templateVars)) {
                            // synchronizes quantities if needed..
                            if (Configuration::get('PS_ADVANCED_STOCK_MANAGEMENT')) {
                                foreach ($order->getProducts() as $product) {
                                    if (StockAvailable::dependsOnStock($product['product_id'])) {
                                        StockAvailable::synchronize($product['product_id'], (int) $product['id_shop']);
                                    }
                                }
                            }

                            Tools::redirectAdmin(self::$currentIndex . '&id_order=' . (int) $order->id . '&vieworder&token=' . $this->token);
                        }
                        $this->errors[] = $this->trans('An error occurred while changing order status, or we were unable to send an email to the customer.', array(), 'Admin.Orderscustomers.Notification');
                    } else {
                        $this->errors[] = $this->trans('The order has already been assigned this status.', array(), 'Admin.Orderscustomers.Notification');
                    }
                }
            } else {
                $this->errors[] = $this->trans('You do not have permission to edit this.', array(), 'Admin.Notifications.Error');
            }