default.php

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<?php
$entity = elgg_extract('entity', $vars);
if (!$entity instanceof ElggEntity) {
    return;
}

$icon_sizes = elgg_get_icon_sizes($entity->type, $entity->getSubtype());
// Get size
$size = elgg_extract('size', $vars, 'medium');
if (!array_key_exists($size, $icon_sizes)) {
    $size = 'medium';
}

$vars['size'] = $size;

$img_class = elgg_extract_class($vars, [], 'img_class');

$title = htmlspecialchars($entity->getDisplayName() ?? '', ENT_QUOTES, 'UTF-8', false);

$url = false;
if (elgg_extract('use_link', $vars, true)) {
    $url = elgg_extract('href', $vars, $entity->getURL());
}

if (!isset($vars['width'])) {
    $vars['width'] = $size != 'master' ? $icon_sizes[$size]['w'] : null;
}

if (!isset($vars['height'])) {
    $vars['height'] = $size != 'master' ? $icon_sizes[$size]['h'] : null;
}

$img_params = [
    'src' => $entity->getIconURL($size),
    'alt' => $entity->hasIcon($size) ? $title : '',
];

if (!empty($img_class)) {
    $img_params['class'] = $img_class;
}

if (!empty($vars['width'])) {
    $img_params['width'] = elgg_extract('width', $vars);
}

if (!empty($vars['height'])) {
    $img_params['height'] = elgg_extract('height', $vars);
}

$img = elgg_view('output/img', $img_params);
if (empty($img)) {
    return;
}

if ($url) {
    $params = [
        'href' => $url,
        'text' => $img,
        'title' => $entity->getDisplayName(),
        'is_trusted' => true,
    ];
    $link_class = elgg_extract_class($vars, [], 'link_class');
    if (!empty($link_class)) {
        $params['class'] = $link_class;
    }

    echo elgg_view('output/url', $params);
} else {
    echo $img;
}