Override Prestashop _best_ -

/classes/Cart.php

/override/classes/Cart.php

return $this->installOverride('classes/Cart.php') && $this->installOverride('controllers/front/ProductController.php'); override prestashop

public function initToolbar() parent::initToolbar(); $this->toolbar_btn['custom_export'] = [ 'href' => self::$currentIndex.'&token='.$this->token.'&export_custom=1', 'desc' => $this->l('Custom Export', null, null, false), 'class' => 'btn btn-primary' ]; /classes/Cart

// Temporarily add at top of your override file if (!defined('_PS_VERSION_')) exit; installOverride('classes/Cart.php') && $this-&gt

<?php // override/modules/blockreassurance/controllers/front/AdditionalProductTabController.php class BlockreassuranceAdditionalProductTabController extends BlockreassuranceAdditionalProductTabControllerCore

public function installOverrides()