Overview

In Magento 2, helper classes are used to store reusable utility functions. These helpers can be called in controllers, models, blocks, and templates.

Step-by-Step Implementation

1. Create a helper class in your module.
2. Define your custom function inside the helper.
3. Inject the helper using Dependency Injection.
4. Call the helper function where needed.

Step 1: Create Helper Class

namespace Vendor\Module\Helper;

use Magento\Framework\App\Helper\AbstractHelper;

class Data extends AbstractHelper
{
    public function getCustomMessage()
    {
        return "Hello from Helper!";
    }
}
    

Step 2: Inject Helper in Class

namespace Vendor\Module\Controller\Index;

use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Vendor\Module\Helper\Data as HelperData;

class Index extends Action
{
    protected $helper;

    public function __construct(
        Context $context,
        HelperData $helper
    ) {
        parent::__construct($context);
        $this->helper = $helper;
    }

    public function execute()
    {
        echo $this->helper->getCustomMessage();
    }
}
    

Step 3: Call Helper in PHTML

/** @var \Vendor\Module\Helper\Data $helper */
$helper = $this->helper('Vendor\Module\Helper\Data');

echo $helper->getCustomMessage();
    

Best Practices

• Use Dependency Injection instead of Object Manager.
• Keep helper functions simple and reusable.
• Avoid adding business logic in helpers; use models/services instead.

Important Notes

• Helpers are globally accessible utility classes.
• Use them for common functions like formatting, config values, etc.
• Clear cache after changes: php bin/magento cache:flush