IntlCalendar::clear

Clear a field or all fields

Description

Object-oriented style

public true IntlCalendar::clear(intnull $field = null)

Procedural style

true intlcal_clear(IntlCalendar $calendar, intnull $field = null)

Clears either all of the fields or a specific field. A cleared field is marked as unset, giving it the lowest priority against overlapping fields or even default values when calculating the time. Additionally, its value is set to 0, though given the fieldʼs low priority, its value may have been internally set to another value by the time the field has finished been queried.

Parameters

calendar: An IntlCalendar instance.
field: One of the IntlCalendar date/time field constants. These are integer values between 0 and IntlCalendar::FIELD_COUNT.

Return Values

Always returns true.

Changelog

Version	Description
8.2.0	The return type is `true` now; previously, it was bool.

Examples

Example #1 IntlCalendar::clear examples

<?php
ini_set('intl.default_locale', 'es_ES');
ini_set('date.timezone', 'UTC');

$fields = array(
    'FIELD_ERA'                  => 0,
    'FIELD_YEAR'                 => 1,
    'FIELD_MONTH'                => 2,
    'FIELD_WEEK_OF_YEAR'         => 3,
    'FIELD_WEEK_OF_MONTH'        => 4,
    'FIELD_DATE'                 => 5,
    'FIELD_DAY_OF_YEAR'          => 6,
    'FIELD_DAY_OF_WEEK'          => 7,
    'FIELD_DAY_OF_WEEK_IN_MONTH' => 8,
    'FIELD_AM_PM'                => 9,
    'FIELD_HOUR'                 => 10,
    'FIELD_HOUR_OF_DAY'          => 11,
    'FIELD_MINUTE'               => 12,
    'FIELD_SECOND'               => 13,
    'FIELD_MILLISECOND'          => 14,
    'FIELD_ZONE_OFFSET'          => 15,
    'FIELD_DST_OFFSET'           => 16,
    'FIELD_YEAR_WOY'             => 17,
    'FIELD_DOW_LOCAL'            => 18,
    'FIELD_EXTENDED_YEAR'        => 19,
    'FIELD_JULIAN_DAY'           => 20,
    'FIELD_MILLISECONDS_IN_DAY'  => 21,
    'FIELD_IS_LEAP_MONTH'        => 22,
    'FIELD_FIELD_COUNT'          => 23,
);
function getSetFields(IntlCalendar $cal) {
    global $fields;
    $ret = array();
    foreach ($fields as $name => $value) {
        if ($cal->isSet($value)) {
            $ret[] = $name;
        }
    }
    return $ret;
}

$cal = new IntlGregorianCalendar(2013, 2 /* March */, 15);
echo "After GregorianCalendar creation\n";
print_r(getSetFields($cal));
echo "\n";

echo IntlDateFormatter::formatObject($cal), "\n";
echo "After the formatter requested the extended year\n";
print_r(getSetFields($cal));
echo "\n";

$cal->clear(IntlCalendar::FIELD_YEAR);
echo "After the year has been cleared, the date stays the same\n";
echo IntlDateFormatter::formatObject($cal), "\n";
echo "because FIELD_EXTENDED_YEAR is still set\n";
print_r(getSetFields($cal));
echo "\n";

var_dump($cal->clear(IntlCalendar::FIELD_EXTENDED_YEAR));
echo "After the extended year has been cleared\n";
print_r(getSetFields($cal));
echo IntlDateFormatter::formatObject($cal), "\n";
echo "\n";

echo "After the fields are recalculated,\n"
        . " extended year is set again (to 1970)\n";
print_r(getSetFields($cal));
echo "\n";

$cal->clear();
echo "After calling variant with no arguments\n";
print_r(getSetFields($cal));
echo IntlDateFormatter::formatObject($cal), "\n";

The above example will output:

After GregorianCalendar creation
Array
(
    [0] => FIELD_ERA
    [1] => FIELD_YEAR
    [2] => FIELD_MONTH
    [3] => FIELD_DATE
)

15/03/2013 00:00:00
After the formatter requested the extended year
Array
(
    [0] => FIELD_ERA
    [1] => FIELD_YEAR
    [2] => FIELD_MONTH
    [3] => FIELD_DATE
    [4] => FIELD_EXTENDED_YEAR
)

After the year has been cleared, the date stays the same
15/03/2013 00:00:00
because FIELD_EXTENDED_YEAR is still set
Array
(
    [0] => FIELD_ERA
    [1] => FIELD_MONTH
    [2] => FIELD_DATE
    [3] => FIELD_EXTENDED_YEAR
)

bool(true)
After the extended year has been cleared
Array
(
    [0] => FIELD_ERA
    [1] => FIELD_MONTH
    [2] => FIELD_DATE
)
15/03/1970 00:00:00

After the fields are recalculated,
 extended year is set again (to 1970)
Array
(
    [0] => FIELD_ERA
    [1] => FIELD_MONTH
    [2] => FIELD_DATE
    [3] => FIELD_EXTENDED_YEAR
)

After calling variant with no arguments
Array
(
)
01/01/1970 00:00:00