TagsSearchFieldsHandler.php

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<?php

namespace Elgg\Search;

class TagsSearchFieldsHandler {

    public function __invoke(\Elgg\Event $event) {

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

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

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

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

        return $value;
    }
}