Why am I not able to use $this is an opencart helper?

I have the following helper function in system/helper/wholesaler.php:

function is_wholesaler() {
  return $this->customer->getCustomerGroupId() != 1 ? TRUE : FALSE;

I loaded the helper in system/startup.php

The problem is that when I try to use the function I get a fatal error "Fatal error: Using $this when not in object context". Is there a way to use $this in a helper?

One alternative option would be to send $this as an argument in is_wholesaler() or add the function in library/customer.php and call it with $this->customer->is_wholesaler() in my opencart template view files.


Try to create an object for the Customer and you can use that object as an reference for that class

$h = new Customer();
function is_wholesaler() {
    return $h->getCustomerGroupId() != 1 ? TRUE : FALSE;

Or you can also create reference like

return Customer::getCustomerGroupId() != 1 ? TRUE : FALSE;

$this refers to an object (class) instance, you can't use it in a individual, you can put function is_wholesaler into a class like:

class Helper{
    private $customer;

    public function __construct($customer){
        $this->customer = $customer;

    function is_wholesaler() {
        return $this->customer->getCustomerGroupId() != 1 ? TRUE : FALSE;

$customer = new Customer(); //I suppose you have a class named Customer in library/customer.php
$helper = new Helper($customer);
$is_wholesaler = $heler->is_wholesaler();

or, you just modify the function is_wholesaler it self as following:

function is_wholesaler() {
    $customer = new Customer(); //still suppose you have a class named Customer
    return $customer->getCustomerGroupId() != 1 ? TRUE : FALSE;

Need Your Help

WPF C# PreviewDrop/Drop event not fired ( With dragadorner)

c# wpf events drag-and-drop adorner

I assume that previewdrop/drop events fired when it detect a drag target with an element as a drop target . In this case , my drop target is a textbox and my drag target is a label. Both of them are

Joda Interval losing timezone information

java jodatime

I am defining a Joda interval as follows:

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.