metadata.php

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<?php
function elgg_get_metadata_from_id($id) {
    return _elgg_services()->metadataTable->get($id);
}

function elgg_delete_metadata_by_id($id) {
    $metadata = elgg_get_metadata_from_id($id);
    if (!$metadata) {
        return false;
    }
    return $metadata->delete();
}

function elgg_get_metadata(array $options = []) {
    return _elgg_services()->metadataTable->getAll($options);
}

function elgg_delete_metadata(array $options) {
    return _elgg_services()->metadataTable->deleteAll($options);
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $hooks->registerHandler('unit_test', 'system', '_elgg_metadata_test');
};