How to insert custom function on template?

[ventesites]

Hello

 

I am using Prestashop 1.6.9 and need to add a function on the featured template.

 

The function is a duplicate with modifs of

 

public function getProducts (class Category.php)

 

The call to the function is :

 

Category::getRandomShopProducts((int)Context::getContext()->language->id, 1, 10);

 

my template is the product-list-feature.tpl (copy of product-list.tpl)

 

But i can't find the way to add it to my template without getting a bunch of errors, i guess i am not placing it at the right place or something like that

 

any idea about this?

 

Thanks

 

Pat