icon.php

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<?php
$icon = elgg_extract('icon', $vars);
if ($icon === false) {
    return;
}

if (isset($icon) && $icon !== true) {
    echo $icon;
    return;
}

$icon_size = elgg_extract('icon_size', $vars, 'small');
$icon_entity = elgg_extract('icon_entity', $vars);
if ($icon_entity instanceof ElggEntity) {
    echo elgg_view_entity_icon($icon_entity, $icon_size, $vars);
    return;
}

if ($icon !== true) {
    return;
}

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

if ($entity->hasIcon($icon_size)) {
    echo elgg_view_entity_icon($entity, $icon_size, $vars);
    return;
}

$owner = $entity->getOwnerEntity();
if (!$owner instanceof ElggEntity) {
    return;
}

echo elgg_view_entity_icon($owner, $icon_size, $vars);