### Install Recurr with Composer

Source: https://github.com/simshaun/recurr/blob/master/README.md

The recommended way to install the Recurr library is through Composer. This command adds Recurr as a dependency to your PHP project.

```bash
composer require simshaun/recurr
```

--------------------------------

### Create RRULE Rule Object from String

Source: https://github.com/simshaun/recurr/blob/master/README.md

Demonstrates how to create a Recurr Rule object by providing an RRULE string, a start date, an optional end date, and the timezone.

```php
$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);
```

--------------------------------

### Monthly Recurring Rule Configuration

Source: https://github.com/simshaun/recurr/blob/master/README.md

Configures how monthly recurring rules handle months with fewer days than the start date. Enables a fix to ensure correct day-of-month progression.

```php
$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));
```

--------------------------------

### RecurrenceCollection Filters

Source: https://github.com/simshaun/recurr/blob/master/README.md

Chainable helper methods for filtering RecurrenceCollection objects based on start and end dates. The `$inc` parameter controls the inclusion of boundary recurrences.

```php
$recurrenceCollection->startsBetween(new \DateTime('2024-01-01'), new \DateTime('2024-01-31'));
$recurrenceCollection->startsBefore(new \DateTime('2024-01-31'));
$recurrenceCollection->startsAfter(new \DateTime('2024-01-01'));
$recurrenceCollection->endsBetween(new \DateTime('2024-01-01'), new \DateTime('2024-01-31'));
$recurrenceCollection->endsBefore(new \DateTime('2024-01-31'));
$recurrenceCollection->endsAfter(new \DateTime('2024-01-01'));
```

--------------------------------

### Transform RRULE to DateTime Objects

Source: https://github.com/simshaun/recurr/blob/master/README.md

Converts a Recurr Rule object into a collection of Recurrence objects, each containing start and end DateTime objects. This uses the ArrayTransformer and has a virtual limit to prevent infinite loops.

```php
$transformer = new \Recurr\Transformer\ArrayTransformer();

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

--------------------------------

### Programmatically Build RRULE Rule

Source: https://github.com/simshaun/recurr/blob/master/README.md

Shows how to construct a Recurr Rule object using chained methods for setting frequency, days, until date, and timezone. The resulting RRULE string can be retrieved using getString().

```php
$rule = (new \Recurr\Rule)
    ->setStartDate($startDate)
    ->setTimezone($timezone)
    ->setFreq('DAILY')
    ->setByDay(['MO', 'TU'])
    ->setUntil(new \DateTime('2017-12-31'))
;

echo $rule->getString(); //FREQ=DAILY;UNTIL=20171231T000000;BYDAY=MO,TU
```

--------------------------------

### Apply Constraints to Date Transformation

Source: https://github.com/simshaun/recurr/blob/master/README.md

Demonstrates using a BeforeConstraint to filter the dates generated from an RRULE. Only dates before August 1, 2014, will be included in the resulting collection.

```php
$startDate   = new \DateTime('2014-06-17 04:00:00');
$rule        = new \Recurr\Rule('FREQ=MONTHLY;COUNT=5', $startDate);
$transformer = new \Recurr\Transformer\ArrayTransformer();

$constraint = new \Recurr\Transformer\Constraint\BeforeConstraint(new \DateTime('2014-08-01 00:00:00'));
print_r($transformer->transform($rule, $constraint));
```

--------------------------------

### RRULE to Text Transformation

Source: https://github.com/simshaun/recurr/blob/master/README.md

Transforms recurrence rules (RRULE) into human-readable text. Supports yearly, monthly, weekly, and daily frequencies. Can optionally use a translator for different locales.

```php
$rule = new \Recurr\Rule('FREQ=YEARLY;INTERVAL=2;COUNT=3;', new \DateTime());
$textTransformer = new \Recurr\Transformer\TextTransformer();
echo $textTransformer->transform($rule);
```

```php
$rule = new \Recurr\Rule('FREQ=YEARLY;INTERVAL=2;COUNT=3;', new \DateTime());
$textTransformer = new \Recurr\Transformer\TextTransformer(
    new \Recurr\Transformer\Translator('de')
);
echo $textTransformer->transform($rule);
```

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