bebeboutik/modules/categoryimg/categoryimg.php

<?php
class CategoryImg extends Module {
	public function __construct() {
		$this->name = 'categoryimg';
		$this->tab = 'front_office_features';
		$this->version = '1.0';

        parent::__construct();

        $this->displayName = $this->l('Category Image');
        $this->description = $this->l('Display image category on left column.');
    }

    public function install() {
		if(!parent::install()
		OR !$this->registerHook('displayLeftVP')) {
			return FALSE;
		}

		return TRUE;
	}

    public function hookdisplayLeftVP($params) {
		global $smarty;

		$id_category = $params['id_category'];
		$id_lang = (int) Tools::getValue('id_lang', Configuration::get('PS_LANG_DEFAULT'));

		if(file_exists(_PS_ROOT_DIR_.'/img/c/'. $id_category. '.jpg')) {
			$category = new Category($id_category, $id_lang);
		}else{
			$id_parent = Category::getIdParent($id_category);

			if(file_exists(_PS_ROOT_DIR_.'/img/c/'. $id_parent. '.jpg')) {
				$category = new Category($id_parent, $id_lang);
			}else{
				$parent_bis = Category::getIdParent($id_parent);
				if(file_exists(_PS_ROOT_DIR_.'/img/c/'. $parent_bis. '.jpg')) {
					$category = new Category($parent_bis, $id_lang);
				}else{
					$category = "";
				}
			}
		}
		if (file_exists(_PS_ROOT_DIR_.'/img/c/'.(int)$params['id_category'].'_thumb_vp.jpg') && $params['id_category'] != $category->id) {
			$id_category_thumb = $params['id_category'];
		} else {
			$id_category_thumb = $category->id;
		}

		$sale = Sale::getSaleFromCategory(Tools::getValue('id_category'));
		$smarty->assign('sale', $sale);
		$smarty->assign('consumable', ((int) _SHOP_PRIVATESALES_CONSUMABLE == (int) $sale->id)? true : false);
		$smarty->assign('category', $category);
		$smarty->assign('is_thumb_vp',(file_exists(_PS_ROOT_DIR_.'/img/c/'.$id_category_thumb.'_thumb_vp.jpg')));
		$smarty->assign('id_category_thumb',$id_category_thumb);
		return $this->display(__FILE__, 'left_img.tpl');
	}
}