<?php ini_set("intl.error_level", E_WARNING); $c = new IntlGregorianCalendar(NULL, 'pt_PT'); var_dump($c->setFirstDayOfWeek()); var_dump($c->setFirstDayOfWeek(1, 2)); var_dump($c->setFirstDayOfWeek(0)); var_dump(intlcal_set_first_day_of_week($c, 0)); var_dump(intlcal_set_first_day_of_week(1, 2));