(PHP 5.5.0, PECL >= 3.0.0a1)
IntlCalendar::getLeastMaximum — Get the smallest local maximum for a field
Object oriented style
$field
   )Procedural style
Returns the smallest local maximumw for a field. This should be a value smaller or equal to that returned by IntlCalendar::getActualMaxmimum(), which is in its turn smaller or equal to that returned by IntlCalendar::getMaximum().
calThe IntlCalendar resource.
field
 One of the IntlCalendar date/time field constants. These are integer
 values between 0 and
 IntlCalendar::FIELD_COUNT.
   An int representing a field value in the fieldʼs
   unit or FALSE on failure.
  
Example #1 Maxima examples
<?php
ini_set('date.timezone', 'UTC');
ini_set('intl.default_locale', 'it_IT');
$cal = new IntlGregorianCalendar(2013, 3 /* April */, 6);
var_dump(
    $cal->getLeastMaximum(IntlCalendar::FIELD_DAY_OF_MONTH),  // 28
    $cal->getActualMaximum(IntlCalendar::FIELD_DAY_OF_MONTH), // 30
    $cal->getMaximum(IntlCalendar::FIELD_DAY_OF_MONTH)        // 31
);
The above example will output:
int(28) int(30) int(31)