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Additional actions when the cart is changed.

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I need to do additional actions when the cart is changed.
I need to read the content of the cart and then check a set of conditions. So, I need to know how to put my set of conditions (a function). 
I want to print an error in the cart summary so I need my function to be executed when a product is changed (add or remove) in that screen.
Can I use a module and put my function on it?

This not work for me:


public function hookActionCartSave(){
      return $this->checkMyCart();

protected function checkMyCart(){
    // My code gos here..

    $this->errors[] = $this->trans(



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Create   a  new  module  and  implement  your  code  inside  it.

The  conditions  will take  effect  since  you  are  calling  the  right   hook.

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