checkbox.php

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<?php
$item = elgg_extract('item', $vars);
$default_value = false;
if ($item instanceof \ElggEntity) {
    $default_value = $item->guid;
} elseif ($item instanceof \ElggExtender) {
    $default_value = $item->id;
}

$value = elgg_extract('value', $vars, $default_value);
if ($value === false) {
    // no value to select
    return;
}

$name = elgg_extract('name', $vars, 'item_id[]');

echo elgg_view('input/checkbox', [
    'name' => $name,
    'value' => $value,
    'default' => false,
]);