Zend Framework 2 : Create Your Custom View Helper

In MVC Architecture, sometimes, we have to do a “logic” to manage a view. The Logic is called by View named View Helper. Zend Framework 2 has a ton of flexibility, so, we can create a custom View Helper if we want to -that can be called by View Layer over modules.

For Example, i want to create a View Helper named Testhelper which the responsibility of this helper is to state that the string is found or not.  First of all, we create a Helper under src directory :
And the content of Testhelper is :

namespace Test\View\Helper;
use Zend\View\Helper\AbstractHelper;

class Testhelper extends AbstractHelper
{
    public function __invoke($str, $find)
    {
        if (! is_string($str)){
            return 'must be string';
        }

        if (strpos($str, $find) === false){
            return 'not found';
        }

        return 'found';
    }
}

The next step is register that in Module.php

namespace Test;

use Zend\ModuleManager\Feature\AutoloaderProviderInterface,
    Zend\ModuleManager\Feature\ConfigProviderInterface,
    Zend\ModuleManager\Feature\ViewHelperProviderInterface;    

class Module implements 
    AutoloaderProviderInterface, 
    ConfigProviderInterface, 
    ViewHelperProviderInterface
{
    public function getAutoloaderConfig(){/*common code*/}
    public function getConfig(){ /*common code */ }

    public function getViewHelperConfig()
    {
        return array(
            'factories' => array(
                'test_helper' => function($sm) {
                    $helper = new View\Helper\Testhelper ;
                    return $helper;
                }
            )
        );   
   }
}

OR, you can SIMPLIFY that by configuring it as an invokable in module.config.php as @weierophinney ( project lead for Zend Framework ) suggestion –thanks a lot for his suggestion– like this :

return array(
//.........
    'view_helpers' => array(
        'invokables'=> array(
            'test_helper' => 'Test\View\Helper\Testhelper'   
        )
    ),
//.........
);

Last step, call it in the view :

echo $this->test_helper("me","e");