Recurr

Recurr is a PHP library for working with recurrence rules (RRULE) and converting them in to DateTime objects.

Recurr was developed as a precursor for a calendar with recurring events, and is heavily inspired by rrule.js.

Installation

Recurr is hosted on packagist, meaning you can install it with Composer.

1. Create a composer.json file

   {
       "require": {
           "simshaun/recurr": "dev-master"
       }
   }
   

   We recommend using a stable version instead of dev-master.

2. Install Composer and run the install command

   wget http://getcomposer.org/composer.phar
   php composer.phar install
   

3. Include Composer's autoloader

   require 'vendor/autoload.php';
   

RRULE to DateTime objects

$timezone    = 'America/New_York';
$startDate   = new \DateTime('2013-06-12 20:00:00', new \DateTimeZone($timezone));
$endDate     = new \DateTime('2013-06-14 20:00:00', new \DateTimeZone($timezone)); // Optional
$rule        = new \Recurr\Rule('FREQ=MONTHLY;COUNT=5', $startDate, $endDate, $timezone);
$transformer = new \Recurr\Transformer\ArrayTransformer();

print_r($transformer->transform($rule));

1. $transformer->transform(...) returns a RecurrenceCollection of Recurrence objects.
2. Each Recurrence has getStart() and getEnd() methods that return a \DateTime object.
3. If the transformed Rule lacks an end date, getEnd() will return a \DateTime object equal to that of getStart().

Note: The transformer has a "virtual" limit (default 732) on the number of objects it generates. This prevents the script from crashing on an infinitely recurring rule. You can change the virtual limit in the call to transform or the ArrayTransformer constructor.

Filtering Recurrences in a RecurrenceCollection

RecurrenceCollection provides the following chainable helper methods to filter out recurrences:

• startsBetween(\DateTime $after, \DateTime $before, $inc = false)
• startsBefore(\DateTime $before, $inc = false)
• startsAfter(\DateTime $after, $inc = false)
• endsBetween(\DateTime $after, \DateTime $before, $inc = false)
• endsBefore(\DateTime $before, $inc = false)
• endsAfter(\DateTime $after, $inc = false)

$inc defines what happens if $after or $before are themselves recurrences. If $inc = true, they will be included in the filtered collection. For example,

pseudo...
2014-06-01 startsBetween(2014-06-01, 2014-06-20) // false
2014-06-01 startsBetween(2014-06-01, 2014-06-20, true) // true

Note: RecurrenceCollection extends the Doctrine project's ArrayCollection class.

RRULE to Text

Recurr supports transforming some recurrence rules in to human readable text. This feature is still in beta and only supports yearly, monthly, weekly, and daily frequencies. It is not yet localized and only supports English.

$rule = new Rule('FREQ=YEARLY;INTERVAL=2;COUNT=3;', new \DateTime());

$textTransformer = new TextTransformer();
echo $textTransformer->transform($rule);

Warnings

• Monthly recurring rules: If your start date is on the 29th, 30th, or 31st, Recurr will skip the months that have less than that number of days. This behavior is configurable:

$timezone    = 'America/New_York';
$startDate   = new \DateTime('2013-01-31 20:00:00', new \DateTimeZone($timezone));
$rule        = new \Recurr\Rule('FREQ=MONTHLY;COUNT=5', $startDate, null, $timezone);
$transformer = new \Recurr\Transformer\ArrayTransformer();

$transformerConfig = new \Recurr\Transformer\ArrayTransformerConfig();
$transformerConfig->enableLastDayOfMonthFix();
$transformer->setConfig($transformerConfig);

print_r($transformer->transform($rule));

/* Recurrences:
 * 2013-01-31
 * 2013-02-28
 * 2013-03-31
 * 2013-04-30
 * 2013-05-31
 */

Contribute

Recurr is still in beta, and is most likely not 100% free of bugs. Feel free to comment or make pull requests. Please include tests with PRs.

License

Recurr is licensed under the MIT License. See the LICENSE file for details.