TagsSearchFieldsHandler.php

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<?php

namespace Elgg\Search;

use Elgg\Hook;

class TagsSearchFieldsHandler {

    public function __invoke(Hook $hook) {

        $value = (array) $hook->getValue();

        $defaults = [
            'metadata' => [],
        ];

        $value = array_merge($defaults, $value);

        $tags = (array) elgg_get_registered_tag_metadata_names();

        $value['metadata'] = array_merge($value['metadata'], $tags);

        return $value;
    }
}