default.php

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<?php
$entity = $vars['entity'];

$icon_sizes = elgg_get_config('icon_sizes');
// Get size
$size = elgg_extract('size', $vars, 'medium');
if (!array_key_exists($size, $icon_sizes)) {
    $size = "medium";
}
$vars['size'] = $size;

$class = elgg_extract('img_class', $vars, '');

if (isset($entity->name)) {
    $title = $entity->name;
} else {
    $title = $entity->title;
}
$title = htmlspecialchars($title, ENT_QUOTES, 'UTF-8', false);

$url = $entity->getURL();
if (isset($vars['href'])) {
    $url = $vars['href'];
}

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 = array(
    'src' => $entity->getIconURL($size),
    'alt' => $title,    
);

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

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

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

$img = elgg_view('output/img', $img_params);

if ($url) {
    $params = array(
        'href' => $url,
        'text' => $img,
        'is_trusted' => true,
    );
    $class = elgg_extract('link_class', $vars, '');
    if ($class) {
        $params['class'] = $class;
    }

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