4 comments

1. I’ve spent many hours searching for the answer also and even asked a Stackoverflow question (WooCommerce: change product image permalink with filter/action hook) which now happens to be duplicate (could not find this question prior to submitting my own).

   The answer:
   

   The hook is woocommerce_cart_item_thumbnail.
   So in your functions.php add

   function custom_new_product_image($a) {
   
       $class = 'attachment-shop_thumbnail wp-post-image'; // Default cart thumbnail class.
       $src = [PATH_TO_YOUR_NEW_IMAGE];
   
       // Construct your img tag.
       $a = '<img';
       $a .= ' src="' . $src . '"';
       $a .= ' class="' . $class . '"';
       $a .= ' />';
   
       // Output.
       return $a;
   
   }
   
   add_filter( 'woocommerce_cart_item_thumbnail', 'custom_new_product_image' );
   

   and your thumbnails will be replaced (more processing needed if you want to change each thumbnail individually).

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2. To change thumbnail image size of WooCommerce cart page you need next steps:

   1. In function.php create the size you need:

      if ( function_exists( 'add_image_size' ) ) {
          add_image_size( 'custom-thumb', 100, 100, true ); // 100 wide and 100 high
      }
      

   2. In cart.php which should be located in your_themewoocommercecartcart.php find

      $thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image( 'custom-thumb' ), $cart_item, $cart_item_key );
      

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3. Please review the WooCommerce cart templates in woocommerce/templates/cart/cart.php.

   There is a clear filter woocommerce_cart_item_thumbnail for the product thumbnail in the cart.

   $thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );
   

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4. Change ‘medium’ for your required image size:

   /**
    * Update cart product thumbnail
    */
   function woocommerce_cart_item_thumbnail_2912067($image, $cartItem, $cartItemKey)
   {
       $id = ($cartItem['variation_id'] !== 0 ? $cartItem['variation_id'] : $cartItem['product_id']);
       return wp_get_attachment_image(get_post_thumbnail_id((int) $id), 'medium');
   }
   add_filter('woocommerce_cart_item_thumbnail', 'woocommerce_cart_item_thumbnail_2912067', 10, 3);
   

   This results in your not having to update the core WooCommerce template files.

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