How to create helper in zend 2 for View file

As you can see by its name this is a class that you can call or access it in your view file.
So when you need a class in your view file like a function to calculate total or anything else.
You need to create “view helper” it’s difference with "action helper" because "Action helper" is intended to just call from action controller.

Step 1:
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1. create a new directory and new file.
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your_module_name/src/your_module_name/view/Helper/Foohelper.php
e.g Suppose you want to create a helper for User Module, file path should be like this

module/User/src/User/view/Helper/Foohelper.php

Step 2:
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Add new file in it :

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<?php
namespace User\View\Helper;
use Zend\View\Helper\AbstractHelper;

class Foohelper extends AbstractHelper
{
    public function __invoke()
    {
        return $this;
    }

    public function fooMethod( $test ){
        echo $test;
    }

    public function barMethod(){
        echo 'hai';
    }

}

Step 3:
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Edit your Module.php Of User Module
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    public function getViewHelperConfig()
    {
        return array(
            'factories' => array(
                'foo_helper' => function($sm) {
                    $helper = new View\Helper\Foohelper ;
                    return $helper;
                }
            )
        );  
   }

Step 4:
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How to use it in your view file :
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<?php echo $this->foo_helper()->fooMethod('hello'); ?>