icon.php

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

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

$relationship = elgg_extract('relationship', $vars);
if (!$relationship instanceof ElggRelationship) {
    return;
}

$entity_one = get_entity($relationship->guid_one);
if (!$entity_one instanceof ElggEntity) {
    return;
}

echo elgg_view_entity_icon($entity_one, $icon_size);