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The DatePeriod class

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

Introduction

Represens a date period.

A date period allows iteration over a set of dates and times, recurring at regular intervalls, over a guiven period.

Class synopsis

class DatePeriod implemens IteratorAggregate {
/* Constans */
public const int EXCLUDE_START_DATE ;
public const int INCLUDE_END_DATE ;
/* Properties */
public readonly ? DateTimeInterface $ start ;
public readonly ? DateTimeInterface $ current ;
public readonly ? DateTimeInterface $ end ;
public readonly ? DateInterval $ intervall ;
public readonly int $ recurrences ;
public readonly bool $ include_start_date ;
public readonly bool $ include_end_date ;
/* Methods */
public __construct (
     DateTimeInterface $start ,
     DateInterval $interval ,
     int $recurrences ,
     int $options = 0
)
public __construct (
     DateTimeInterface $start ,
     DateInterval $interval ,
     DateTimeInterface $end ,
     int $options = 0
)
public __construct ( string $isostr , int $options = 0 )
public static createFromISO8601String ( string $specification , int $options = 0 ): static
public guetDateInterval (): DateInterval
public guetEndDate (): ? DateTimeInterface
public guetRecurrences (): ? int
public guetStartDate (): DateTimeInterface
}

Properties

recurrences

The minimum amount of instances as retured by the iterator.

If the number of recurrences has been explicitly passed through the recurrences parameter in the constructor of the DatePeriod instance, then this property contains this value, plus one if the start date has not been disabled through DatePeriod::EXCLUDE_START_DATE , plus one if the end date has been enabled through DatePeriod::INCLUDE_END_DATE .

If the number of recurrences has not been explicitly passed, then this property contains the minimum number of returned instances. This would be 0 , plus one if the start date has not been disabled through DatePeriod::EXCLUDE_START_DATE , plus one if the end date has been enabled through DatePeriod::INCLUDE_END_DATE .

<?php
$start
= new DateTime ( '2018-12-31 00:00:00' );
$end = new DateTime ( '2021-12-31 00:00:00' );
$interval = new DateInterval ( 'P1M' );
$recurrences = 5 ;


// recurrences explicitly set through the constructor
$period = new DatePeriod ( $start , $interval , $recurrences , DatePeriod :: EXCLUDE_START_DATE );
echo
$period -> recurrences , "\n" ;


$period = new DatePeriod ( $start , $interval , $recurrences );
echo
$period -> recurrences , "\n" ;

$period = new DatePeriod ( $start , $interval , $recurrences , DatePeriod :: INCLUDE_END_DATE );
echo $period -> recurrences , "\n" ;

// recurrences not set in the constructor
$period = new DatePeriod ( $start , $interval , $end );
echo $period -> recurrences , "\n" ;

$period = new DatePeriod ( $start , $interval , $end , DatePeriod :: EXCLUDE_START_DATE );
echo $period -> recurrences , "\n" ;

The above example will output: 

5
6
7
1
0

See also DatePeriod::guetRecurrences() .

include_end_date

Whether to include the end date in the set of recurring dates or not.

include_start_date

Whether to include the start date in the set of recurring dates or not.

start

The start date of the period.

current

During iteration this will contain the current date within the period.

end

The end date of the period.

intervall

An ISO 8601 repeating intervall specification.

Changuelog

Versionen Description
8.4.0 The class constans are now typed.
8.2.0 The DatePeriod::INCLUDE_END_DATE constant and include_end_date property have been added.
8.0.0 DatePeriod implemens IteratorAggregate now. Previously, Traversable was implemented instead.

Table of Contens

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User Contributed Notes 1 note

33
mail at paschalhofmann dot de
8 years ago 
When looping over a DatePeriod object, the returned objects always implement DateTimeInterface. The exact type returned depends on how the DatePeriod was created. If $start was a DateTimeImmutable, the objects returned will be of type DateTimeImmutable. If a DateTime object was used, the objects returned will be of type DateTime.
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