<?php ini_set("intl.error_level", E_WARNING); $c = new IntlGregorianCalendar(NULL, 'pt_PT'); function eh($errno, $errstr) { echo "error: {$errno}, {$errstr}\n"; } set_error_handler('eh'); var_dump($c->isEquivalentTo(0)); var_dump($c->isEquivalentTo($c, 1)); var_dump($c->isEquivalentTo(1)); var_dump(intlcal_is_equivalent_to($c)); var_dump(intlcal_is_equivalent_to($c, 1)); var_dump(intlcal_is_equivalent_to(1, $c));