How can I call a function of one module in another module? I want to call uc_stock_adjust() function of uc_stock.module in my own custom module. Is it possible?

Here is my code so far:

function my_module_node_presave($node){ 
  if($node->type == 'add_stock') { 
    $stock_value = $node->field_stock_value['und'][0]['value']; 
    $sku = $node->field_sku['und'][0]['value']; 
    if (module_exists('uc_stock') && function_exists('uc_stock_adjust')) {
      uc_stock_adjust($sku, $stock_value); 

I want to add and delete stock of products by using reference uc_stock_adjust(), which is defined in uc_stock.module, in my custom module. But when I try the above code, it doesn't work.

It giving an error, and the error is:

Notice: Undefined variable: sku in my_module_node_presave() (line 29 of \sites\all\modules\my_module\my_module.module)‌​

  • 1
    have you tried calling the function in your custom module? You can call the functions from any module. Jan 24, 2013 at 6:30
  • It is possible by a simple function call (as in PHP), but it isn't recommended. As the most module functions (hooks) are called on a certain event automatically by Drupal.
    – AjitS
    Jan 24, 2013 at 6:31
  • iam calling uc_stock_adjust function of uc_stock module in my custom module under node_presave function. But it giving an error, and the error is:
    – aashi
    Jan 24, 2013 at 6:36
  • Notice: Undefined variable: sku in my_module_node_presave() (line 29 of D:\xampp\htdocs\photo\photogallary\sites\all\modules\my_module\my_module.module).
    – aashi
    Jan 24, 2013 at 6:37
  • any solution for the above error: undefinrd variable?
    – aashi
    Jan 24, 2013 at 6:51

3 Answers 3


To call the function of one module in another module:

  1. If the function is not in the .module file, call module_load_include()

    //Load node.admin.inc from the node module
    module_load_include('inc', 'node', 'node.admin');
  2. Call the function from the other module


Undefined variable: sku means that you have not declared a value for the variable $sku. Have you done debugging to make sure that $node->field_sku['und'][0]['value'] outputs a value?

  • yes i had done debugging and it outputs the sku value that i have entered manually and that is: tshirts
    – aashi
    Jan 29, 2013 at 4:50

See module_invoke(). This calls a function (hook) in a specified module.

The given hook uc_stock_adjust() can thus be called by: module_invoke('uc_stock', 'adjust');. (Note that this is because the function follows Drupal conventions of module_name_function_name).

If desired additional arguments can also be passed to a function's parameters with: module_invoke('uc_stock', 'adjust', $first_param_to_pass, $second_param_to_pass, $etc);

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