I need to alter Ubercart product price on Ubercart 3, Drupal 7, when product is added to cart. I need to check some conditions, and if met, change the price. I thought i can go with

function MYMODULE_uc_cart_item($op, &$item) {  
  switch ($op) {
    case 'load':
      drupal_set_message(t('It works!'), 'status');

but not sure am i targeting right hook.

It seems that it does not work (it is not invoked).

Thanks for clues

  • hooks are the right way to programmatically interact with modules. May be you can set it with rules module, i am not sure.
    – niksmac
    Jan 21, 2013 at 13:19
  • no, i want to do it from my custom module. hook is described here, but cant get it to work: ubercart.org/docs/api/hook_cart_item
    – NenadP
    Jan 21, 2013 at 13:22
  • Please post the code youre using in your custom module.
    – niksmac
    Jan 21, 2013 at 13:26
  • See updated code.
    – NenadP
    Jan 21, 2013 at 13:33
  • function hook_uc_cart_item($op, &$item) { the work hook should be replaced with your modules name like function YOURMODULENAME_uc_cart_item($op, &$item)
    – niksmac
    Jan 21, 2013 at 14:04

3 Answers 3


Here is another hook you can play with hook_uc_add_to_cart

$nid - the node ID of the product
$qty - the quantity being added
$data - the data array, including attributes and model number adjustments

Here is how to work with hooks

Drupal's module system is based on the concept of "hooks". A hook is a PHP function that is named foo_bar(), where "foo" is the name of the module (whose filename is thus foo.module) and "bar" is the name of the hook. Each hook has a defined set of parameters and a specified result type.

function hook_uc_cart_item($op, &$item) { the work hook should be replaced with your modules name like

function YOURMODULENAME_uc_cart_item($op, &$item)

See Hooks

  • 1
    Sorry if question have misleaded you.I implemented it in my module, of course, by replacing hook with my module name (i have written some custom modules before). I cannot get it to work though, so I hope someone experienced in hooking Ubercart might help. sorry for trouble, i will try to change question a bit.
    – NenadP
    Jan 21, 2013 at 14:10
  • @HoverFusion see my edit.
    – niksmac
    Jan 21, 2013 at 14:15
  • Nikhil, thanks for suggestion, here's my upvote :) and thanks for your effort. I answered the question myself, as it was issue with cache.
    – NenadP
    Jan 21, 2013 at 14:27
  • You suggested the hook that best fits my question, but my final goal is little more complex, so i will go mainly with uc_cart_alter, see my answer update.
    – NenadP
    Jan 21, 2013 at 15:24

The problem was in clearing cache. For some reason, clearing cache from Drush does not completely work. (I need to clear it from interface). It might be also APC i implemented at some point. I have issues when clearing cache for modules/other code.


I can't get hook_uc_cart_item to work so far. (even as hook_cart_item) hook_add_to_cart works, and hook_uc_cart_alter also works (for me)

I think i might take hook_cart_alter approach, as it gets items every time cart is viewed, in fact, they say it gets loaded all the time, and they have warned of performance issue, but as i need to watch on cart all the time as i have some dynamic calculations depending what is in cart, i think, if devel and kcachegrind dont complain, i will not, too :)

I see uc_coupon module also uses hook_cart_alter without fear :)

  • Did you ever find a solution? Feb 19, 2015 at 19:00
  • I can't remember, it was ages ago! :) Sorry
    – NenadP
    Feb 19, 2015 at 19:04
  • Posting my answer because it took me 2 hours to find what seems so obvious now. Feb 19, 2015 at 19:08

This is how I solved it:

function mymodule_uc_cart_alter(&$items) 
    $items[45]->price = 29393;

In this example I'm just hardcoding the change to demonstrate how to change the value. Obviously you would apply your own logic here based on whatever your requirements are.

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