什么是PHP的strtotime（）的第一个工作日？

Question

strtotime() in PHP is quite powerfull function. One of it's features is relative dates.

For example this command:

echo date('Y-m-d', strtotime('Sunday this week'));

produces 2016-02-14 on my machine (today is "2016-02-12", Friday). Thus it supposes that first day of week is Monday. However in different locales countries first day of week is different. Is there a way to change this behaviour and make strtotime() think that first week day is Sunday?

Answer 1

PHP 5.5 introduced the Internationalization extension, which among many useful functions provides and IntCalendar class. It has a static function getFirstDayOfWeek which can be used to get the first day of the week, based a locale.

Straight from the docs:

ini_set('date.timezone', 'UTC');

$cal1 = IntlCalendar::createInstance(NULL, 'es_ES');
var_dump($cal1->getFirstDayOfWeek()); // Monday