如何在OpenCart中创建自定义SEO友好URL

我想要http://example.com/index.php?route=checkout/cart显示为http://example.com/cart.几天前，我在StackOverflow中找到了答案(http://stackoverflow.com/q/7578055/1236271)。我对seo_url文件进行了必要的更改，还更新了数据库，但它仍然不适用于我。我的seo_url文件有什么错误吗？这是我的seo_url.php文件。

<?php
class ControllerCommonSeoUrl extends Controller {
public function index() {
    // Add rewrite to url class
    if ($this->config->get('config_seo_url')) {
        $this->url->addRewrite($this);
    }
    // Decode URL
    if (isset($this->request->get['_route_'])) {
        $parts = explode('/', $this->request->get['_route_']);
        foreach ($parts as $part) {
            $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "url_alias WHERE keyword = '" . $this->db->escape($part) . "'");
            if ($query->num_rows) {
                $url = explode('=', $query->row['query']);                  
                if ($url[0] == 'product_id') {
                    $this->request->get['product_id'] = $url[1];
                }                   
                if ($url[0] == 'category_id') {
                    if (!isset($this->request->get['path'])) {
                        $this->request->get['path'] = $url[1];
                    } else {
                        $this->request->get['path'] .= '_' . $url[1];
                    }
                }               
                if ($url[0] == 'manufacturer_id') {
                    $this->request->get['manufacturer_id'] = $url[1];
                }               
                if ($url[0] == 'information_id') {
                    $this->request->get['information_id'] = $url[1];
                }
            } else {
                $this->request->get['route'] = 'error/not_found';   
            }
        }           
        if (isset($this->request->get['product_id'])) {
            $this->request->get['route'] = 'product/product';
        } elseif (isset($this->request->get['path'])) {
            $this->request->get['route'] = 'product/category';
        } elseif (isset($this->request->get['manufacturer_id'])) {
            $this->request->get['route'] = 'product/manufacturer/product';
        } elseif (isset($this->request->get['information_id'])) {
            $this->request->get['route'] = 'information/information';
        }
        else {
                            $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "url_alias WHERE keyword = '" . $this->db->escape($this->request->get['_route_']) . "'");
            if ($query->num_rows) {
                $this->request->get['route'] = $query->row['query'];
            }
       }
        if (isset($this->request->get['route'])) {
            return $this->forward($this->request->get['route']);
        }
    }
}

public function rewrite($link) {
    if ($this->config->get('config_seo_url')) {
        $url_data = parse_url(str_replace('&amp;', '&', $link));

        $url = ''; 

        $data = array();

        parse_str($url_data['query'], $data);

        foreach ($data as $key => $value) {
            if (isset($data['route'])) {
                if (($data['route'] == 'product/product' && $key == 'product_id') || (($data['route'] == 'product/manufacturer/product' || $data['route'] == 'product/product') && $key == 'manufacturer_id') || ($data['route'] == 'information/information' && $key == 'information_id')) {
                    $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "url_alias WHERE `query` = '" . $this->db->escape($key . '=' . (int)$value) . "'");

                    if ($query->num_rows) {
                        $url .= '/' . $query->row['keyword'];

                        unset($data[$key]);
                    }                   
                } elseif ($key == 'path') {
                    $categories = explode('_', $value);

                    foreach ($categories as $category) {
                        $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "url_alias WHERE `query` = 'category_id=" . (int)$category . "'");

                        if ($query->num_rows) {
                            $url .= '/' . $query->row['keyword'];
                        }                           
                    }

                    unset($data[$key]);
                }
                else {
                    $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "url_alias WHERE `query` = '" . $this->db->escape($data['route']) . "'");
                    if ($query->num_rows) {
                        $url .= '/' . $query->row['keyword'];
                        unset($data[$key]);
                    }
               }

            }
        }

        if ($url) {
            unset($data['route']);

            $query = '';

            if ($data) {
                foreach ($data as $key => $value) {
                    $query .= '&' . $key . '=' . $value;
                }

                if ($query) {
                    $query = '?' . trim($query, '&');
                }
            }

            return $url_data['scheme'] . '://' . $url_data['host'] . (isset($url_data['port']) ? ':' . $url_data['port'] : '') . str_replace('/index.php', '', $url_data['path']) . $url . $query;
        } else {
            return $link;
        }
    } else {
        return $link;
    }       
}   
}
?>