OpenCart仅SSL环境异常：购物车按钮失效及cart.tpl索引未定义报错

Hey there, let's work through this issue step by step—those PHP notices and unresponsive buttons are likely linked, so we'll tackle them together:

• Resolve the "Undefined index: recurring" Notice First
  The error at line 19 of cart.tpl happens because the template is trying to access $product['recurring'] without checking if that index actually exists. This is super common when products don't have a recurring subscription option enabled.

  1. Open your theme's catalog/view/theme/[your-theme]/template/checkout/cart.tpl file
  2. Jump to line 19 and find the code referencing $product['recurring']
  3. Wrap that section in an existence check to block the notice:

     <?php if (isset($product['recurring']) && !empty($product['recurring'])) { ?>
         <!-- Your existing code that uses $product['recurring'] -->
     <?php } ?>
     

  PHP notices can break JavaScript execution in the background, which is a huge reason your buttons aren't working—fixing this removes that roadblock.

• Fix SSL-Related Form/AJAX Blocking
  In SSL-only mode, browsers block mixed content (HTTP requests sent from an HTTPS page), which is almost certainly why your buttons just refresh without doing anything:

  1. Check Form Action URLs: Make sure your cart form's action attribute uses a valid HTTPS URL. In cart.tpl, this should be using the $action variable passed from the controller (generated via OpenCart's $this->url->link() method). If you have a hardcoded HTTP URL here, replace it with <?php echo $action; ?>.
  2. Verify Config Settings: Double-check your config.php and admin/config.php files:
     • Set HTTPS_SERVER to your full HTTPS domain (e.g., https://yourstore.com/)
     • Set HTTPS_CATALOG to the same HTTPS domain
  3. Audit AJAX Requests: If the refresh icon or other buttons use AJAX, ensure the call URLs are generated with $this->url->link() (not hardcoded HTTP) to avoid mixed-content blocks.

• Clean Up Other PHP Notices
  Those extra "Undefined variable" or "Undefined index" warnings can also mess with page functionality. Go through your error log and fix each one:

  • For undefined variables: Make sure the cart controller (catalog/controller/checkout/cart.php) initializes every variable passed to the template (e.g., $data['some_variable'] = ''; even if it's empty)
  • For undefined indexes: Add isset() checks in the template wherever you access array elements, just like we did for the recurring index.

• Clear All Caches
  Finally, wipe any cached content to ensure your changes take effect:

  • OpenCart's internal cache (via Admin > System > Maintenance > Cache)
  • Your browser cache (do a hard refresh with Ctrl+Shift+R or Cmd+Shift+R)
  • If you're using a CDN or server-side cache, clear that too

These steps should get your cart buttons working again and eliminate those PHP notices in your SSL-only environment.

内容的提问来源于stack exchange，提问作者user9312112