bludit/bl-themes/clean-blog/init.php

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<?php
/*
This file is loaded before the theme
You can add some configuration code in this file
*/
// Background image
$backgroundImage = 'https://source.unsplash.com/1600x900/?nature';
if ($page->coverImage()===false) {
$domImage = DOM::getFirstImage($page->content($fullContent=true));
if ($domImage!==false) {
$backgroundImage = $domImage;
}
} else {
$backgroundImage = $page->coverImage($absolute=true);
}