(PHP 5.5.0, PECL >= 3.0.0a1)
IntlCalendar::set — Set a time field or several common fields at once
Object oriented style
$field
   , int $value
   )$year
   , int $month
   [, int $dayOfMonth = NULL
   [, int $hour = NULL
   [, int $minute = NULL
   [, int $second = NULL
  ]]]] )Procedural style
$cal
   , int $year
   , int $month
   [, int $dayOfMonth = NULL
   [, int $hour = NULL
   [, int $minute = NULL
   [, int $second = NULL
  ]]]] )Sets either a specific field to the given value, or sets at once several common fields. The range of values that are accepted depend on whether the calendar is using the lenient mode.
For fields that conflict, the fields that are set later have priority.
This method cannot be called with exactly four arguments.
calThe IntlCalendar resource.
field
 One of the IntlCalendar date/time field constants. These are integer
 values between 0 and
 IntlCalendar::FIELD_COUNT.
valueThe new value of the given field.
year
      The new value for IntlCalendar::FIELD_YEAR.
     
month
      The new value for IntlCalendar::FIELD_MONTH.
     
dayOfMonth
      The new value for IntlCalendar::FIELD_DAY_OF_MONTH.
      The month sequence is zero-based, i.e., January is represented by 0,
      February by 1, …, December is 11 and Undecember (if the calendar has
      it) is 12.
     
hour
      The new value for IntlCalendar::FIELD_HOUR_OF_DAY. 
     
minute
      The new value for IntlCalendar::FIELD_MINUTE.
      
second
      The new value for IntlCalendar::FIELD_SECOND.  
     
   Returns TRUE on success and FALSE on failure.
  
Example #1 IntlCalendar::set()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
ini_set('intl.default_locale', 'pt_PT');
//Calls made later have priority
$cal = new IntlGregorianCalendar(2013, 6 /* July */, 1);
$cal->set(IntlCalendar::FIELD_YEAR, 2012);
$cal->set(IntlCalendar::FIELD_EXTENDED_YEAR, 2011);
var_dump(IntlDateFormatter::formatObject($cal));
$cal = new IntlGregorianCalendar(2013, 6 /* July */, 1);
$cal->set(IntlCalendar::FIELD_YEAR, 2012);
$cal->set(IntlCalendar::FIELD_EXTENDED_YEAR, 2011);
//the time has not been recalculated yet. If we clear the extended year,
//the year set before will be used
$cal->clear(IntlCalendar::FIELD_EXTENDED_YEAR);
var_dump(IntlDateFormatter::formatObject($cal));
The above example will output:
string(20) "01/07/2011, 00:00:00" string(20) "01/07/2012, 00:00:00"