How to create a custom hook in PrestaShop?

Hooks are gaining importance in PrestaShop shopping cart development day by day as they allow you to add additional functionality at specific points. Today I’ll teach you how to create custom hooks in your PrestaShop module.
Use below steps:
1. Register your hook using function. Place this function into install section.
$this->registerHook(‘displayCustomHtmlContent’);

2. Create hook function.

/**
      * Add the custom content on front
      */
     public function hookDisplayCustomHtmlContent()
     {
         $custom_html = Configuration::get(‘CUSTOMHOOK_CONTENT’);
         $this->context->smarty->assign(‘custom_html’, $custom_html);
         $this->smarty->assign(
             array(
                 ‘custom_html_test’ => $custom_html
             )
         );
         return $this->display(__FILE__, ‘customhook.tpl’);
     }

3. Display your code anywhere on any tpl using below function.

{hook h=’displayCustomHtmlContent’}