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RRule field for Advanced Custom Fields

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# ACF RRule Field

Create recurring rules within a single ACF field and retrieve all the dates using the [simshaun/recurr](https://github.com/simshaun/recurr) package.

![ACF RRule Screenshot](https://pixelparfait.fr/_github/acf-rrule.png)

## Usage

```php
<?php $rrule = get_field('rrule'); ?>
```

The RRule field returns an array with the following attributes:

| Attribute             | Type                | Description                                                                         |
| --------------------- | ------------------- | ----------------------------------------------------------------------------------- |
| **rrule**             | *string*            | The RRule string describing the recurring rule                                      |
| **start_date**        | *string*            | The start date of the recurrence (Ymd)                                              |
| **start_time**        | *string*            | The start time of the recurrence (H:i:s)                                            |
| **frequency**         | *string*            | The selected frequency (DAILY\|WEEKLY\|MONTHLY\|YEARLY)                             |
| **interval**          | *int*               | The interval set for the frequency                                                  |
| **weekdays**          | *array\<string\>*   | An array of days for the weekly frequency                                           |
| **monthdays**         | *array\<string\>*   | An array of days for the monthly frequency                                          |
| **months**            | *array\<int\>*      | An array of months for the yearly frequency                                         |
| **monthly_by**        | *string*            | The selected option for the monthly frequency (monthdays\|setpos)                   |
| **bysetpos**          | *array\<int\>*      | The starting numbers for the monthly "setpos" option                                |
| **byweekday**         | *array\<string\>*   | The selected days for the monthly "setpos" option                                   |
| **end_type**          | *string*            | The end of the recurrence (date\|count)                                             |
| **end_date**          | *string*            | The end date in YYYYMMDD format for the recurrence when `end_type` is set to "date" |
| **occurence_count**   | *int*               | The number of occurences for the recurrence when `end_type` is set to "count"       |
| **dates_collection**  | *array\<DateTime\>* | An array containing all the DateTime objects generated by your recurring rule       |
| **text**              | *string*            | A text representation for your recurring rule                                       |
| **first_date**        | *DateTime*          | The first occurrence of the recurrence (since v1.4.0)                               |
| **last_date**         | *DateTime*          | The last occurrence of the recurrence (since v1.4.0)                                |

### Advanced usage

A common use case for this plugin is creating an agenda-style display for your events. Here is how I usually do it.

In the following example we will assume you have an `event` custom post type with an ACF RRule field named `rrule`.

The first step is to use the `acf/save_post` hook to save the first and last dates in database. This is necessary for querying our events later.

```php
/**
 * Save first & last occurrences of an event in database.
 *
 * @param  int|string  $post_id
 * @return void
 */
add_action('acf/save_post', function (int|string $post_id) {
    if (! $post_id || get_post_type($post_id) !== 'event') {
        return;
    }

$rrule = get_field('rrule');

update_post_meta($post_id, 'start_date', $rrule['first_date']->format('Y-m-d'));
    update_post_meta($post_id, 'end_date', $rrule['last_date']->format('Y-m-d'));
});
```

You will then be able to use the `start_date` and `end_date` meta values in a custom `WP_Query` to filter events that may have occurrences between the specified dates.

```php
$startDate = date('Y-m-d'); // Today
$endDate = date('Y-m-d', strtotime('+1 month', strtotime($startDate))); // Today + 1 month

// Retrieve events starting before the end date
// and ending after the start date
$eventsQuery = new WP_Query([
    'post_type' => 'event',
    'posts_per_page' => -1,
    'post_status' => 'publish',
    'meta_query' => [
        'relation' => 'AND',
        [
            'key' => 'start_date',
            'compare' => '<=',
            'value' => $endDate,
            'type' => 'DATE',
        ],
        [
            'key' => 'end_date',
            'compare' => '>=',
            'value' => $startDate,
            'type' => 'DATE',
        ],
    ],
]);
```

The next and last step is to create an associative array of dates. Each date will be an array of events that occurs at the given date.

```php
// Instanciate an array for our list of dates
$dates = [];

while ($eventsQuery->have_posts()) {
    $eventsQuery->the_post();

$recurrence = get_field('rrule');

// Loop through the individual dates for the recurrence
    foreach ($recurrence['dates_collection'] as $datetime) {
        $date = $datetime->format('Y-m-d');

if ($date < $startDate) {
            // If the date is before the start date, jump directly to the next one
            continue;
        } elseif ($date > $endDate) {
            // If the date is after the end date, break the loop
            break;
        }

// Create the date if it doesn't exist yet
        if (! isset($dates[$date])) {
            // Each date will contain an array of events
            $dates[$date] = [];
        }

// Use the event ID as key to avoid duplicates
        $dates[$date][$post->ID] = $post;
    }

// Sort array by key
    ksort($dates);
}
```

Of course this is a very basic example that you will have to adapt to your use case.

## Testing

```
vendor/bin/phpcs -p . --standard=PHPCompatibilityWP --extensions=php --runtime-set testVersion 7.2-
```

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