[Solved] Returning XLM on a view

I’m creating an API in wich I need to return some News as an XML file.
Im using CakePhp version 3.4.6.

Here’s what I’ve done so far:
In config/routes.php:
I’ve added $routes->extensions(['xml']);

In Controller/NewsController.php:
public function api()
$news = $this->News
->order([‘date’ => ‘DESC’]);
$this->set(’_serialize’, [‘news’]);

In Template/News/xml/api.ctp:

<?php foreach($news as $news): ?> <?php $title = strip_tags($news->title); $content = strip_tags($news->content); ?> <?= $title ?> <?= $content ?> <?= $news->date->i18nFormat('YYYY-MM-dd'); ?> <?php endforeach; ?>

In Template/Layout/xml/xml.ctp:

<?= $this->fetch('content') ?>

So far, it’s Ok, except that I am missing the XML declaration.
If I add <?xml version="1.0" encoding="UTF-8" ?> on top of Template/Layout/xml/xml.ctp, I get a server 500 Error: PHP Parse error: syntax error, unexpected ‘version’ (T_STRING) in […] /src/Template/Layout/xml/xml.ctp.

Do I need a proper XML declaration for regular APIs?
Could anyone help me solve my proble?

Thanks for reading this, and helping).

Maybe you could try by putting this in your layout xml.ctp:

<?= '<?xml version="1.0" encoding="UTF-8" ?>' ?>

This worked!
Thank you!

Sorry, why <?= '<?xml version="1.0" encoding="UTF-8" ?>' ?> and not simply <?xml version="1.0" encoding="UTF-8" ?>?