(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)
IntlCalendar::getFirstDayOfWeek — Get the first day of the week for the calendar?s locale
面向对象风格
过程化风格
The week day deemed to start a week, either the default value for this locale or the value set with IntlCalendar::setFirstDayOfWeek().
calThe IntlCalendar resource.
One of the constants IntlCalendar::DOW_SUNDAY,
IntlCalendar::DOW_MONDAY, ...,
IntlCalendar::DOW_SATURDAY 或者在失败时返回 FALSE.
Example #1 IntlCalendar::getFirstDayOfWeek()
<?php
ini_set('date.timezone', 'UTC');
$cal1 = IntlCalendar::createInstance(NULL, 'es_ES');
var_dump($cal1->getFirstDayOfWeek()); // Monday
$cal1->set(2013, 1 /* February */, 3); // a Sunday
var_dump($cal1->get(IntlCalendar::FIELD_WEEK_OF_YEAR)); // 5
$cal2 = IntlCalendar::createInstance(NULL, 'en_US');
var_dump($cal2->getFirstDayOfWeek()); // Sunday
$cal2->set(2013, 1 /* February */, 3); // a Sunday
var_dump($cal2->get(IntlCalendar::FIELD_WEEK_OF_YEAR)); // 6
以上例程会输出：
int(2) int(5) int(1) int(6)