protected function get_contrib_list() {
        return array_map(function($plugins) {
            return array_filter($plugins, function($plugindata) {
                return !$plugindata->is_standard();
            });
        }, \core_plugin_manager::instance()->get_plugins());
    }
protected function get_contrib_list() {
        return array_map(function($plugins) {
            return array_filter($plugins, function($plugindata) {
                return !$plugindata->is_standard();
            });
        }, \core_plugin_manager::instance()->get_plugins());
    }
protected function get_contrib_list ( ) { return array_map ( function ( $ plugins ) { return array_filter ( $ plugins , function ( $ plugindata ) { return ! $ plugindata -> is_standard ( ) ; } ) ; } , \ core_plugin_manager :: instance ( ) -> get_plugins ( ) ) ; }
Returns a list of contributed plugins installed on the system.

@return array A list of contributed plugins installed.
Returns a list of contributed plugins installed on the system .