thumb.php

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<?php
if (elgg_extract('show_thumb', $vars, !elgg_extract('cropper_enabled', $vars, true)) === false) {
    return;
}

$entity = elgg_extract('entity', $vars);
if (!$entity instanceof ElggEntity) {
    // no way to check for icon
    return;
}

$icon_type = elgg_extract('icon_type', $vars, 'icon');
$size = elgg_extract('thumb_size', $vars, 'medium');

if (!$entity->hasIcon($size, $icon_type)) {
    // no icon uploaded
    return;
}

echo elgg_format_element('div', ['class' => ['elgg-entity-icon-edit-thumb']], elgg_view('output/img', [
    'src' => $entity->getIconURL([
        'size' => $size,
        'type' => $icon_type,
    ]),
    'alt' => "{$icon_type}-{$size}",
    'title' => $entity->getDisplayName(),
]));