Codeigniter:配置文件，使应用程序在实时和本地运行

我遇到了一个奇怪的麻烦，我使用的是2.1版本的Codeigniter，问题是在config.php文件的第一行后有空格在代码

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

长话短说我的"添加到购物车"按钮不工作，如果有空间之后，但我试图设置CI的默认时间通过做

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
date_default_timezone_set('Asia/Karachi'); 

它在本地服务器上工作得很好，但在实时服务器上更改没有影响，而且即使在删除空间和默认时区后，实时版本的行为也是有线的，它不会将产品添加到卡上。
这是服务器版，你可以去
查看"在线购物车"选项选择
"汉堡"选项选择
"添加到购物车"，它将重定向到"查看产品"页面，我不明白它是如何发生的。
链接:193.42.156.121/hk
视图中两个链接的代码:

 <li> 
   <a href="<?php echo site_url().'cart/fetch_product/'.$product->id; ?>" class="view">
      Add to
      <br>
      Cart
    </a> 
</li>

控制器看起来像这样，视图发送它的链接:

    function add_to_cart($data='')
{
        $product_id     = $this->input->post('id');
        $quantity       = $this->input->post('quantity');
        $post_options   = $this->input->post('option');
        if (!empty($data)) 
        {   
            $product_id     = $data['direct_product']->id;
            $quantity       = 1;
            // print_r($data['product']);
             // $data['product']->track_stock = $data['product']->track_stock = 0;
            // echo $stock =$data['product']->track_stock ;
        }
        // Get a cart-ready product array
        $product = $this->Product_model->get_cart_ready_product($product_id, $quantity);
        // print_r($product);
        // die();
        //if out of stock purchase is disabled, check to make sure there is inventory to support the cart.
        // echo $this->config->item('allow_os_purchase')." Purcahse allow <br>";
        // echo (bool)$product['track_stock'].' Track stock <br>';
        // die();
        if(!$this->config->item('allow_os_purchase') && (bool)$product['track_stock'])
        {
            $stock  = $this->Product_model->get_product($product_id);
            //loop through the products in the cart and make sure we don't have this in there already. If we do get those quantities as well
            $items      = $this->go_cart->contents();
            $qty_count  = $quantity;
            foreach($items as $item)
            {
                if(intval($item['id']) == intval($product_id))
                {
                    $qty_count = $qty_count + $item['quantity'];
                }
                echo $qty_count."<br>";
            }
            if($stock->quantity < $qty_count)
            {
                //we don't have this much in stock
                $this->session->set_flashdata('error', sprintf(lang('not_enough_stock'), $stock->name, $stock->quantity));
                $this->session->set_flashdata('quantity', $quantity);
                $this->session->set_flashdata('option_values', $post_options);

                redirect($this->Product_model->get_slug($product_id));
            }
        }
        // echo $this->config->item('allow_os_purchase')." Purcahse allow <br>";
        // echo (bool)$product['track_stock'].' Track stock <br>';
        // die();
        // Validate Options 
        // this returns a status array, with product item array automatically modified and options added
        //  Warning: this method receives the product by reference
        $status = $this->Option_model->validate_product_options($product, $post_options);
        // print_r($status);
        // die();
        $start_time_in_24_hour  = date("H:i", strtotime($this->setting['opening_time']));
        $end_time_in_24_hour    = date("H:i", strtotime($this->setting['closing_time']));
        $timestamp = date("H:i", time());
        if(
            !($start_time_in_24_hour <= $timestamp && $end_time_in_24_hour <= $timestamp)
          )
        {
            $this->session->set_flashdata('error', 'shop is closed');
            redirect($this->Product_model->get_slug($product_id));
        }
        if( ! $status['validated'])
        {
            $this->session->set_flashdata('quantity', $quantity);
            $this->session->set_flashdata('error', $status['message']);
            $this->session->set_flashdata('option_values', $post_options);
            redirect($this->Product_model->get_slug($product_id));
        } 
        else 
        {
            //Add the original option vars to the array so we can edit it later
            $product['post_options']    = $post_options;
            //is giftcard
            $product['is_gc']           = false;
            // Add the product item to the cart, also updates coupon discounts automatically
            // print_r($product);
            // die();
            $this->go_cart->insert($product);
            if (!empty($data)) 
            {
                $this->session->set_flashdata('message','Product added');
                redirect('onlineOrder');
            }
            // go go gadget cart!
            redirect('cart/view_cart');
        }
    // }
}

我在这个函数中得到的每个值都是正确的，但不知道为什么我的链接
http://193.42.156.121/hk/cart/fetch_product/56被重定向到
http://193.42.156.121/hk/veggie-burger
它是怎么做到的?你知道吗?