protected function get_extra_modules_code() {
        if (empty($this->extramodules)) {
            return '';
        }
        return html_writer::script(js_writer::function_call('M.yui.add_module', array($this->extramodules)));
    }
protected function get_extra_modules_code() {
        if (empty($this->extramodules)) {
            return '';
        }
        return html_writer::script(js_writer::function_call('M.yui.add_module', array($this->extramodules)));
    }
protected function get_extra_modules_code ( ) { if ( empty ( $ this -> extramodules ) ) { return '' ; } return html_writer :: script ( js_writer :: function_call ( 'M.yui.add_module' , array ( $ this -> extramodules ) ) ) ; }
Adds extra modules specified after printing of page header.

@return string
Adds extra modules specified after printing of page header .