toutpratique/override/modules/blockbestsellers/blockbestsellers.php

<?php

class BlockBestSellersOverride extends BlockBestSellers
{	
	public function install()
	{
		if (!parent::install()
			|| !$this->registerHook('displayHome')
		)
			return false;
		return true;
	}

	public function hookdisplayHome($params)
	{
		if (!$this->isCached('blockbestsellers-home.tpl', $this->getCacheId('blockbestsellers-home')))
		{
			BlockBestSellers::$cache_best_sellers = $this->getBestSellers($params);
			$this->smarty->assign(array(
				'best_sellers' => BlockBestSellers::$cache_best_sellers,
				'homeSize' => Image::getSize(ImageType::getFormatedName('home'))
			));
		}

		if (BlockBestSellers::$cache_best_sellers === false)
			return false;

		return $this->display(__FILE__, 'blockbestsellers-home.tpl', $this->getCacheId('blockbestsellers-home'));
	}


	protected function getBestSellers($params)
	{
		if (Configuration::get('PS_CATALOG_MODE'))
			return false;

		if (!($result = ProductSale::getProductHome((int)$params['cookie']->id_lang, 0, (int)Configuration::get('PS_BLOCK_BESTSELLERS_TO_DISPLAY'))))
			return (Configuration::get('PS_BLOCK_BESTSELLERS_DISPLAY') ? array() : false);

		$currency = new Currency($params['cookie']->id_currency);
		$usetax = (Product::getTaxCalculationMethod((int)$this->context->customer->id) != PS_TAX_EXC);
		foreach ($result as &$row)
			$row['price'] = Tools::displayPrice(Product::getPriceStatic((int)$row['id_product'], $usetax), $currency);

		return $result;
	}

}