Creates a new DatePeriod object

说明

public DatePeriod::__construct ( DateTimeInterface $start , DateInterval $interval , int $recurrences , int $options = 0 )

public DatePeriod::__construct ( DateTimeInterface $start , DateInterval $interval , DateTimeInterface $end , int $options = 0 )

public DatePeriod::__construct ( string $isostr , int $options = 0 )

Creates a new DatePeriod object.

参数

start: The start date of the period.
interval: The interval between recurrences within the period.
recurrences: The number of recurrences. Must be greater than 0.
end: The end date of the period.
isostr: An ISO 8601 repeating interval specification. Zero occurrences (R0/) are not supported.
options: Can be set to DatePeriod::EXCLUDE_START_DATE to exclude the start date from the set of recurring dates within the period.

更新日志

版本	说明
7.2.19, 7.3.6, 7.4.0	`recurrences` must be greater than `0` now.

范例

示例 #1 DatePeriod example


<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');
$recurrences = 4;
$iso = 'R4/2012-07-01T00:00:00Z/P7D';

// All of these periods are equivalent.
$period = new DatePeriod($start, $interval, $recurrences);
$period = new DatePeriod($start, $interval, $end);
$period = new DatePeriod($iso);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
foreach ($period as $date) {
    echo $date->format('Y-m-d')."\n";
}
?>

以上例程会输出：

示例 #2 DatePeriod example with DatePeriod::EXCLUDE_START_DATE


<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');

$period = new DatePeriod($start, $interval, $end,
                         DatePeriod::EXCLUDE_START_DATE);

// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
// Note that, in this case, 2012-07-01 is not printed.
foreach ($period as $date) {
    echo $date->format('Y-m-d')."\n";
}
?>

以上例程会输出：

注释

Unbound numbers of repetitions as specified by ISO 8601 section 4.5 "Recurring time interval" are not supported, i.e. neither passing "R/..." as isostr nor passing null as end would work.