header_image.php

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<?php
$header_url = elgg_extract('header_url', $vars);
if ($header_url === false) {
    // we do not want a header image
    return;
}

$entity = elgg_extract('entity', $vars);
$type = 'header';
$size = 'header';

$class = ['elgg-header-image'];

if (empty($header_url)) {
    if (!$entity instanceof \ElggEntity || !$entity->hasIcon($size, $type)) {
        return;
    }
    
    $class[] = "elgg-header-image-{$entity->type}-{$entity->subtype}";
    
    $header_url = $entity->getIconUrl(['type' => $type, 'size' => $size]);
}

echo elgg_format_element('div', [
    'class' => $class,
], elgg_format_element('div', ['style' => "background-image: url({$header_url})"]));