UserSearchProfileFieldsHandler.php

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<?php

namespace Elgg\Search;

use Elgg\Hook;

class UserSearchProfileFieldsHandler {

    public function __invoke(Hook $hook) {

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

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

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

        $profile_fields = _elgg_services()->fields->get('user', 'user');
        foreach ($profile_fields as $field) {
            $value['annotations'][] = "profile:{$field['name']}";
        }

        return $value;
    }
}