- var_dump: documentation ( source)
<?php
$cal = IntlCalendar::createInstance('Asia/Riyadh', 'ar_SA');
$cal->set(2013,11,22); // friday
var_dump( $cal->isWeekend() );
$cal->set(2013,11,23); // saturday
var_dump( $cal->isWeekend() );
$cal->set(2013,11,24); // sunday
var_dump( $cal->isWeekend() );