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(PHP 5 >= 5.5.0, PHP 7, PHP 8, PECL >= 3.0.0a1)
IntlCalendar::setFirstDayOfWeek — Set the day on which the week is deemed to start
面向对象风格
$dayOfWeek): bool
过程化风格
Defines the day of week deemed to start the week. This affects the behavior
of fields that depend on the concept of week start and end such as
IntlCalendar::FIELD_WEEK_OF_YEAR and
IntlCalendar::FIELD_YEAR_WOY.
calendar
IntlCalendar 实例。
dayOfWeek
One of the constants IntlCalendar::DOW_SUNDAY,
IntlCalendar::DOW_MONDAY, …,
IntlCalendar::DOW_SATURDAY.
总是返回 true 。
示例 #1 IntlCalendar::setFirstDayOfWeek()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
ini_set('intl.default_locale', 'es_ES');
$cal = IntlCalendar::createInstance();
$cal->set(2013, 5 /* June */, 30); // A Sunday
var_dump($cal->getFirstDayOfWeek()); // 2 (Monday)
echo IntlDateFormatter::formatObject($cal, <<<EOD
'local day of week: 'cc'
week of month : 'W'
week of year : 'ww
EOD
), "\n";
$cal->setFirstDayOfWeek(IntlCalendar::DOW_SUNDAY);
echo IntlDateFormatter::formatObject($cal, <<<EOD
'local day of week: 'cc'
week of month : 'W'
week of year : 'ww
EOD
), "\n";
以上例程会输出：
int(2) local day of week: 7 week of month : 4 week of year : 26 local day of week: 1 week of month : 5 week of year : 27
