catalog/controller/checkout/checkout.php

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<?php

/**
 * @copyright        2019 opencart.cn - All Rights Reserved
 * @link             http://www.guangdawangluo.com
 * @author:          Sam Chen <sam.chen@opencart.cn>
 * @created:         2017-07-31 11:48:04
 * @modified by:     Sam Chen <sam.chen@opencart.cn>
 * @modified:        2020-01-10 14:25:51
 */

class ControllerCheckoutCheckout extends Controller
{
    protected $ADDRESS_FIELDS = array(
        'firstname',
        'lastname',
        'email',
        'calling_code',
        'telephone',
        'company',
        'address_1',
        'address_2',
        'city',
        'postcode',
        'country_id',
        'zone_id',
        'city_id',
        'county_id',
        'custom_field',
    );

    public function __construct($registry)
    {
        parent::__construct($registry);
        $this->load->language('checkout/cart');
        $this->load->language('checkout/coupon');
        $this->load->language('checkout/checkout');
        $this->load->model('account/activity');
        $this->load->model('account/custom_field');
        $this->load->model('tool/upload');
        $this->load->model('account/address');
        $this->load->model('account/customer');
        $this->load->model('account/customer_group');
        $this->load->model('localisation/country');
        $this->load->model('localisation/zone');
        $this->load->model('checkout/checkout');
        $this->load->model('checkout/order');
    }

    public function index()
    {
        if (!$this->isValidCart()) {
            $this->log('Cart invalid');
            $this->session->data['error'] = t('error_cart_invalid');
            $this->response->redirect($this->url->link('checkout/cart'));
            return;
        }

        // Redirect if guest checkout disabled
        if (!$this->customer->isLogged() && !$this->isGuestCheckoutEnabled()) {