Новые продукты из нужных категорий! - [VM1] Общие вопросы и ошибки

if ( $category_id ) {
...
...
}

if ( $category_id ) {
	// BEGIN - MultiCategory Display - deneb
	$cat_ids = explode(",",$category_id);
	if (count($cat_ids) > 1){
		$multi_cats = 1;
	}
	// END - MultiCategory Display - deneb
	
	$q  = "SELECT DISTINCT product_sku FROM #__{vm}_product, #__{vm}_product_category_xref, #__{vm}_category WHERE \n";
	$q .= "(#__{vm}_product.product_parent_id='' OR #__{vm}_product.product_parent_id='0') \n";
	$q .= "AND #__{vm}_product.product_id=#__{vm}_product_category_xref.product_id \n";
	$q .= "AND #__{vm}_category.category_id=#__{vm}_product_category_xref.category_id \n";
	// BEGIN - MultiCategory Display - deneb
	if ($multi_cats){
		$i = 1;
		$q .= "AND (";
		foreach ($cat_ids as $cat_id){
			if ($i == count($cat_ids)){
				$q .= "(#__{vm}_category.category_id='$cat_id')";
			} else {
				$q .= "(#__{vm}_category.category_id='$cat_id') OR \n";
			}
			$i++;
		}
		$q .= ")  \n";
	} else {
		$q .= "AND #__{vm}_category.category_id='$category_id' \n";
	}
	// END - MultiCategory Display - deneb
	$q .= "AND #__{vm}_product.product_publish='Y' \n";
	$q .= "AND #__{vm}_product.product_special='Y' \n";
	if( CHECK_STOCK && PSHOP_SHOW_OUT_OF_STOCK_PRODUCTS != "1") {
		$q .= " AND product_in_stock > 0 \n";
	}
	$q .= "ORDER BY product_name ASC LIMIT 0, $max_items \n";
}