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);

        $profile_fields = array_keys((array) elgg_get_config('profile_fields'));
        array_walk($profile_fields, function(&$value) {
            $value = "profile:{$value}";
        });

        $value['annotations'] = array_merge($value['annotations'], $profile_fields);

        return $value;
    }
}