Image collection as array with URLs of each image

I’m trying to convert a $files-collection into an array with URLs of each file and don’t know how to achieve this. In the docs i found an article how to convert a page object into a PHP array and also the same with a collection.
Maybe one of you can help me with the correct $callback or a better way to achieve it.

This is how the array should look like:
array(
mysite.com/content/home/image-1.jpg’,
mysite.com/content/home/image-2.jpg’,
mysite.com/content/home/image-3.jpg
)

<?php 

$fileUrls = $page->images()->pluck('url');
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