Shopware 6: How to add custom PHP code to frontend / theme (eg. footer)

Question

What is the best way, to add custom PHP code to my Shopware 6 Shop and how to do this? I need the code executed in all pages (so maybe simply add to the footer or header).

Sample code:

<?php
for ($i=1; $i<=10; $i++) {
    echo 'hello world ' . $i . '<br>';
}
?>

I need it, adding some php scripts to the frontend / theme.

I have tried to create a plugin, but I did not find out, if it is possible and where to integrate my PHP code to execute in the footer or other pages.

Update:

• Info: removed the part for what purpose / why I need this. So some comments below this Questions can be ignored.

Solution from @Feanor works perfect! It solved all my problems. Simple way to reproduce this, use console with:

bin/console plugin:create YourPluginName

Only yes to "Subscriber Event". Plugin refresh, install and activate. Then just add

use Shopware\Storefront\Event\StorefrontRenderEvent;

to the MySubscriber.php and replace the other code with the code from Feanor

Create "YourPluginName/src/Resources/views/storefront/layout/footer/footer.html.twig", add the rest of the code and have fun =)

Answer 1

Ok, there will be such solution. First, you should override current footer template. You neeed to create file in your plugin path views/storefront/layout/footer/footer.html.twig. My example is looking so

 {% sw_extends '@Storefront/storefront/layout/footer/footer.html.twig' %}
 {% block layout_footer_inner_container %}
 {{ parent() }}
 <div class="custom">{{customFooter|raw}}</div>
 {% endblock %}

Second, you need to create a subscriber to the event Shopware\Storefront\Event\StorefrontRenderEvent I implemented it such way and it works

 /**
 * @return string[]
 */
public static function getSubscribedEvents()
{
    return [StorefrontRenderEvent::class=>'onFooterLoad'];
}


/**
 * @param StorefrontRenderEvent $event
 * @return void
 */
public function onFooterLoad($event){
    $result = '';
    for ($i=1; $i<=10; $i++) {
        $result.='hello world ' . $i . '<br>';
    }
    $event->setParameter('customFooter',$result);
}

Then this code will be executed on every frontend page. I don't provide services.xml and I think, you know, how to configure it and to implement subscriber class. Good luck with implementing it.