IntlCalendar::setFirstDayOfWeek

(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)

IntlCalendar::setFirstDayOfWeekSet the day on which the week is deemed to start

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public IntlCalendar::setFirstDayOfWeek ( int $dayOfWeek ) : bool

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intlcal_set_first_day_of_week ( IntlCalendar $cal , int $dayOfWeek ) : bool

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.

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cal

The IntlCalendar resource.

dayOfWeek

One of the constants IntlCalendar::DOW_SUNDAY, IntlCalendar::DOW_MONDAY, ..., IntlCalendar::DOW_SATURDAY.

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Returns TRUE on success. Failure can only happen due to invalid parameters.

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Example #1 IntlCalendar::setFirstDayOfWeek()

<?php
ini_set
('date.timezone''Europe/Lisbon');
ini_set('intl.default_locale''es_ES');

$cal IntlCalendar::createInstance();
$cal->set(2013/* 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";

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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