UserSearchFieldsHandler.php

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<?php

namespace Elgg\Search;

class UserSearchFieldsHandler {

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

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

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

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

        $fields = [
            'username',
            'name',
            'description',
        ];
        
        if (elgg_in_context('admin') && elgg_is_admin_logged_in()) {
            $fields[] = 'email';
        }

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

        return $value;
    }
}