Enabling Faceted Search Php4 .4

Local drupal installation is php5.1.2, remote is php4.4.4 - Both running Drupal 5.2
Faceted Search module enables fine on local but on remote I get this error:

Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /home/xxxxxxx/domains/xxxxxxxx/public_html/drupal/sites/all/modules/faceted_search/faceted_search_ui.module on line 381

The line in faceted_search_ui.module is:

$labels[] = check_plain($facet->get_active_category()->get_label());