(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1)
IntlCalendar::clear — Clear a field or all fields
面向对象风格
$field = NULL
] )过程化风格
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 field?s low priority, its value may have been internally set to another value by the time the field has finished been queried.
calThe IntlCalendar resource.
field
One of the IntlCalendar date/time field constants. These are integer
values between 0 and
IntlCalendar::FIELD_COUNT.
Returns TRUE on success 或者在失败时返回 FALSE. Failure can only occur is
invalid arguments are provided.
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";
以上例程会输出：
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