(PHP 5 >= 5.5.0, PHP 7, PHP 8, PECL >= 3.0.0a1)
IntlCalendar::getRepeatedWallTimeOption — Get behavior for handling repeating wall time
Style orienté objet
Style procédural
   Gets the current strategy for dealing with wall times that are repeated
   whenever the clock is set back during dailight saving time end transitions.
   The default value is IntlCalendar::WALLTIME_LAST.
  
This function requires ICU 4.9 or later.
calendarUne instance IntlCalendar.
   One of the constants IntlCalendar::WALLTIME_FIRST or
   IntlCalendar::WALLTIME_LAST.
  
Exemple #1 IntlCalendar::getRepeatedWallTimeOption()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
ini_set('intl.default_locale', 'en_US');
ini_set('intl.error_level', E_WARNING);
//On October 27th at 0200, the clock goes back 1 hour and from GMT+01 to GMT+00
$cal = new IntlGregorianCalendar(2013, 9 /* October */, 27, 1, 30);
var_dump($cal->getRepeatedWalltimeOption()); // 0 WALLTIME_LAST
$formatter = IntlDateFormatter::create(
    NULL,
    IntlDateFormatter::FULL,
    IntlDateFormatter::FULL,
    'UTC'
);
var_dump($formatter->format($cal->getTime() / 1000.));
$cal->setRepeatedWalltimeOption(IntlCalendar::WALLTIME_FIRST);
var_dump($cal->getRepeatedWalltimeOption()); // 1 WALLTIME_FIRST
$cal->set(IntlCalendar::FIELD_HOUR_OF_DAY, 1);
var_dump($formatter->format($cal->getTime() / 1000.));
L'exemple ci-dessus va afficher :
int(0) string(42) "Sunday, October 27, 2013 at 1:30:00 AM GMT" int(1) string(43) "Sunday, October 27, 2013 at 12:30:00 AM GMT"