Get id_product in a hook from a module (Prestashop 1.7)

[GaShin]

I would like to recover the product id to be able to make my ajax call which needs the product id of the current product page. So I use the hook displayProductAdditionnalInfo which correctly returns the id_product to me but when I try to call it in another method, it returns me false. 

Can you help me? Is there a solution or an alternative ?

  

[Guest]

return Tools::getValue('id_product');
or
return $params['id_product'];